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Discover the ultimate comfort and performance with our men's lightweight base layer collection. Designed for optimal breathability and moisture-wicking, these base layers keep you dry and comfortable during any activity. Perfect for layering, they provide a snug fit without adding bulk, making them ideal for outdoor adventures or workouts. Crafted from soft, durable materials, our lightweight base layers ensure freedom of movement while regulating body temperature. Elevate your activewear essentials and experience the perfect blend of functionality and style.
$38.22
WAS: $60.00*
Each of the Cold Gear Base Layers, base layer, base layer 2. 0 and base layer 3. 0 are great. ... fit fitted baselayer technology ua base™ 2. 0 active baselayer is lightweight, flexible, and breathable for high...
5
Micheile
Feels great keeps you warm
5
NHummingbird
Very comfortable and good for mild to moderate cold weather. I would recommend
5
Brian31
This 2. 0 is comfortable and warm. Perfect baselayer to shred the slopes with. Wicks moisture as advertised. Awesome shirt
5
Jeff H 150
Great fit and very comfortable. Very warm when out in the elements but not too hot while working inside. Would definitely buy another one.
5
Kpax1
This base layer is warm, comfortable and lightweight.
See Price in Cart
WAS: $34.99*
Good fit ... Very good quality product highly recommend! ... My son loves them! ... machine wash with cold ... dry® wicks away sweat rugged flex® moves with you fights
$159.99
Quick delivery, charges great, and heats up quickly. ... He was very impressed with the smaller flat battery. ... It keeps me so warm and cozy and I couldn ’ t imagine life without it
5
Renee
You don ’ t realize how much you need a heated base layer until you have one! It ’s been such a benefit to various aspects of my life. I wear it beneath my layers when spending time outdoors during winter in Wisconsin. But I ’ ve also worn it to work( in an office) during especially cold days. It fits true to size and is comfy. Somehow it seems to trap heat inside yet it ’s also breathable, I don ’ t sweat in it like I have with other base layers.
5
The Base Layer Shirt takes the bite out of any cold day! And the battery last for hours! Washed it in a cold wash then hung it to dry, easy peesey! Definitely worth it!
5
I bought the base layer for my son who works at Disneyland in Anaheim Ca. and he loves it. Keeps hos 3X body warm when working nights. Great product
5
GLWS
Just wearing the shirt and not on has been enough to keep me warm. The few times I have used the heat, I set it on lthe lowest setting and was plenty warm.
5
Luke B
Definitely worth having extra battery banks if you ’ re skiing all day or anything like that, also could use an extra hole in the battery pouch so you can route the cable to a pant pocket more easily. Besides that, it definitely lasts through the wash and multiple winters
See Price in Cart
WAS: $90.00*
I was surprised how thin and lightweight this shirt was: not transparent, but not opaque, either. ... Love the fit and breathability, a bit less wool and more synthetic than other brands I wear, but it works for me since this is a hiking base layer that I wear multiple times...
5
Gandhi
[ Bought for a hiking baselayer. Expensive but I think its worth it. More comfy in the cold than a synthetic baselayer. Not a compression shirt. I use under a fleece. Does n't smell after a full day of hiking.
5
Jackie28
[ This is my second purchase of a Smartwool Men 's Classic All- Season Merino LS Base Layer- this is a great lighter weight item that breathes well but is warm enough when it gets cooler.
5
Rover Dog
[ I own several Smartwool tops but this is one of my favorites. The slightly heavier material is ideal for stand alone yet still layers nicely. Never bulky. Quality is what you would expect from Smartwool. Excellent.
5
Tony99
[ I have tried more than one brand of merino tops Keep coming back to smart wool for best quality and fit. They also keep their shape. The price is inline with other brands
5
Thunderbolt417
[ I 've long been an unabashed devotee of all Smartwool products but their base layers, like the classic all- season merino long sleeve shirt, is truly the best money can buy. Since my days of living in the frigid mountains of northern Utah, I 've discovered the breathability of Smartwool 's all- season merino long sleeve base layer makes it both the perfect shirt for keeping warm on winter 's coldest days as well as ideal workout apparel. Smartwool base layers also make the best all- season pajamas imaginable. The all- season merino long sleeve shirt feels like a gentle hug when you slip it on, and remains comfortable until you 've completed your workout — whether it be a 3- mile hike in the frigid cold or a home gym weight training session. Smartwool has long been the gold standard for merino wool apparel. When you purchase your first Smartwool product, you 'll understand why.
$47.98-$85.00
WAS: $85.00*
with core spun technology, smartwool has wrapped lightweight merino around a nylon core for added durability, while still keeping the comfort of ultra- soft, responsibly- sourced merino next to
5
MAJB
Great quality, ordered for my husband for Christmas. He loved it... would order again.
See Price in Cart
WAS: $120.00*
merino sport yarn provides durability and fast dry times of polyester ... slim fit to follow contours of the body 3d mapping results in near custom fit and movement freedom seamlessly knit mesh ventilation designed to keep you dry and comfortable size medium inseam: 21. 5
$65.67-$115.00
WAS: $115.00*
Solid base layer ... awesome base layer ... I love the base layer line of Smartwool. ... love the thin layer and wool is not itchy ... My son loves wearing thermal bottoms for
5
Wesley on the Rocks
[ I highly recommend these for all of your snow adventures. I wear mine directly under my snow pants and they work perfectly for warmth and movement. This base layer helped me survive snowboarding in both Colorado and Canada. Buy a pair, its worth every penny!
5
Jordan
[ I ’ ve worn this pair of wool pants as a base layer a couple of times in the snow and stayed warm. They fit and feel great! I definitely recommend!
5
Joe1
[ Bought two pairs of these for a snow trip. Great feel and regulated temp perfect. Alternated the pairs and neither smelled after solid week+ of use.
5
Littlemisstexas
[ Purchased this for someone. They gave a thumbs up. I personally own a pair of women ’s smart wool. Money well spent. They last a long time, and they ’ re as comfortable as it gets.
5
Chris K
[ I bought this base layer bottom for a ski trip to Colorado. This did a great job keeping me warm in the cold mornings and wicking sweat away in the warmer afternoons.
$80.00
our lightest, most breathable performance tank featuring cool- lite™ eyelet mesh throughout, the merino 125 cool- lite™ speed short sleeve t- shirt is ideal for running and any other high- intensity pursuits in warm conditions cool- lite™- breathable and lightweight fabric blend...
5
Alex
[ I got two of these for daily undershirts. It is very comfortable and of excellent quality, a little baggier than expected.
$32.27
WAS: $60.00*
fit fitted baselayer leggings inseam: 30 1/2 ” technology ua base™ 2. 0 active baselayer is lightweight, flexible, and breathable for high activity performance in cool conditions moisture transport system wicks sweat and dries quickly ua scent control prevents the growth of odor...
5
Tracey2020
These under armor thermals are a family favorite.
5
Mcdavid97
The base layer fit comfortably nice and snug. It kept me very warm as I was skating out in the cold winter weather.
5
Jdog523
I 've been wearing under my pants and they 've kept me warm during 0 degree weather
5
Avery111
These are great for my winter garage workouts. Slim layer fit really well under joggers. I always size up for tights and they fit nicely. Great amount of stretch, which I really need as a dancer.
5
LP25
Bought these for my husband and he loves them. He has a couple 3. 0 sets and has worm then for a least 6 years. They wear great.
$130.00
slim fit merino sport yarn combines the power of merino with the durability and fast dry times of polyester seamlessly knit mesh ventilation designed to keep you dry and comfortable 3d mapping provides maximum mobility while ribbed elbows provide added durability lightweight,...
$80.00
If I wanted a lightweight base layer for, say, the Ghost Shadow Hoody synthetic down jacket, it ’s an excellent pairing. ... It's a great base layer and good for cool/cold weather
5
E Rubble
Reviewing this from the POV of an end user& tech fabric geek. Love the materials of the MH AirMesh. Already have the hoody; just bought the crew. Agree w/ those who say it 's very warm when at standstill or w/ a wind layer over top, yet while moving or with wind and no wind layer it 's like being naked. To me that says the fabric is functioning precisely how a base layer shoulder. Only con is hypothetical: delicate fabric. I 've had no issues with snags, pilling, abrasion, etc. But I would n't be surprised were I to, given the softness of the fibers and the openness of the fabric they 're arranged into. Cut/fit are unremarkable w/ exception of the somewhat high neck hole and the different accent fabric used there. Packs tiny, resilient fibers bounce back into shape immediately. Most comparable to the Patagonia Cap Air wool base layer, minus the itchiness/roughness and the ultra premium price point. Also, like Polartec Power Stretch pro, but much lighter and more airy fabric, fwiw.
5
Friestadt
I recently purchased a red version of the AirMesh. I find it incredibly warm for its weight. Packs down to nothing which is very helpful.
5
Ruff Ruff
[ My daughter bought me this shirt last year for my 90th birthday. In hot weather or cool temps it seems to trap the air and is the perfect shirt. I have gotten 3 more in sundry colors for myself, one for my wife, and a crew neck airmesh for my adult son.
5
Evan
In the first image, it is very light and breathable, but the fibers inside seem to be easily lost, and there are some fibers in the hand after a little scratch. I am 167cm tall and my bust is 98cm, so I wear a size M which is very comfortable. I bought 2 at the same time, for me it should be good for sweating a lot without losing warmth. I tried wearing it the other way around and it was a different feeling, like a normal sweatshirt. A very special piece of clothing, worth trying. When washing, do n't turn it around, it 's better to put it in a laundry bag
5
JP
Love this shirt. Wear it all the time and have already ordered another one- so comfortable. If they eventually make a short sleeved version I 'll buy that, too. It 's a great base layer and good for cool/cold weather chillin'. Be aware that there is zero wind blocking- it 's a mesh fabric- you must have a shell if you 're hiking/skiing/walking to mailbox. That said- I 've hiked in 15- 20F with wind and just this base and a heavy shell no problem. Note: It 's very `` roomy ''. Great for me, but if you 're a bean pole you may be swimming in it- think about that when selecting sizes.
$90.00
side seams help minimize chafing while wearing a pack and offer a body- enhancing fit. ... this top uses their lightest- weight merino fabric wrapped around a nylon core to increase durability, while still keeping the 100% soft, merino wool you love next to
$47.98-$85.00
WAS: $85.00*
a year- round favorite, the classic all- season merino base layer bottoms work hard to keep you comfortable everywhere, from the ski lifts to the
$85.00
Love the fabric and the fit is a bit baggy in a good way. ... Simple and trendy, wear anywhere shirt! ... Shirt appears larger than expected at first, after first cold water wash, no dryer hang dry, fits as
5
Aaron
[ Shirt is mostly as expected, soft and breathable, and odor resistant. I do wish the shirt was a little thicker so it 's less see- through( which would hopefully also help with making it more durable)
5
JG
[ The Merino Tech Lite II Short Sleeve T- Shirt is hands down one of the best t- shirts I 've owned. It 's lightweight, soft, and super versatile, making it perfect for everything from hiking to casual wear. Why I Love It: ✔ Soft& Comfortable- No itch, just smooth merino that feels great against the skin. ✔ Breathable& Moisture- Wicking- Stays cool in warm weather and dries quickly. ✔ Odor- Resistant- Worn it multiple times between washes, and it still smells fresh. ✔ Great Fit& Versatility- Works well as a standalone tee or a base layer. A Couple of Considerations: ⚠ Fabric is lightweight, so be mindful of snags. ⚠ A bit pricey, but the quality and durability make it worth it. If you 're looking for a high- quality merino t- shirt that 's comfortable, breathable, and perfect for any occasion, this one 's a winner. I 'll definitely be buying more!
5
Dee
[ Just reviewed the long sleeve base layer, and like both of these tops. Since it is still winter in Colorado, I have been wearing the short sleeve T- shirt on the 65 degree days we sometimes have. I also like to wear the men 's as opposed to the ladies for the looser fit.
5
Geoff
[ I love these icebreaker shirts. I own several in different colors, prints, etc. Very breathable and comfortable. No chafing or scratching on my chest. I 've had issues with other Mfg products on this front. With good care I 've found these to last a while( i. e. line dry only).
5
FunkyCity
[ My dad loves these shirts and is a committed fan! Thanks Icebreaker
$85.00
They fit like a classic T- shirt, do n't wrinkle, itch or stink. ... Super soft shirt that helps keep cool in the summer heat. ... Very comfortable and not itchy ... Highly recommend if you are looking for a warm weather shirt that can be work into the office or on a hike/long
5
Aaron
[ Shirt is mostly as expected, soft and breathable, and odor resistant. I do wish the shirt was a little thicker so it 's less see- through( which would hopefully also help with making it more durable)
5
JG
[ The Merino Tech Lite II Short Sleeve T- Shirt is hands down one of the best t- shirts I 've owned. It 's lightweight, soft, and super versatile, making it perfect for everything from hiking to casual wear. Why I Love It: ✔ Soft& Comfortable- No itch, just smooth merino that feels great against the skin. ✔ Breathable& Moisture- Wicking- Stays cool in warm weather and dries quickly. ✔ Odor- Resistant- Worn it multiple times between washes, and it still smells fresh. ✔ Great Fit& Versatility- Works well as a standalone tee or a base layer. A Couple of Considerations: ⚠ Fabric is lightweight, so be mindful of snags. ⚠ A bit pricey, but the quality and durability make it worth it. If you 're looking for a high- quality merino t- shirt that 's comfortable, breathable, and perfect for any occasion, this one 's a winner. I 'll definitely be buying more!
5
Dee
[ Just reviewed the long sleeve base layer, and like both of these tops. Since it is still winter in Colorado, I have been wearing the short sleeve T- shirt on the 65 degree days we sometimes have. I also like to wear the men 's as opposed to the ladies for the looser fit.
5
Geoff
[ I love these icebreaker shirts. I own several in different colors, prints, etc. Very breathable and comfortable. No chafing or scratching on my chest. I 've had issues with other Mfg products on this front. With good care I 've found these to last a while( i. e. line dry only).
5
FunkyCity
[ My dad loves these shirts and is a committed fan! Thanks Icebreaker
$85.00
The best summer base layer you can buy ... breathable and lightweight cool- lite fabric blend is designed to help keep you cool offset shoulder seams to prevent friction droptail hem for added coverage side splits at hem for added ventilation and
5
AP
[ Nice casual soft base layer. Very thin and lightweight. Nice color and decent price on sale.
5
PB
[ This is a great shirt. Super soft and light. Great for travel and as a base layer for chili days or evenings. The only gripe is that I bought one of these a year ago, size large. When I bought the most recent one the large was now too tight. So I bought an extra large. Body fit is now great but sleeves are long!!
5
Al
[ I bought 2- 3 yearly of these type since 2017 and almost all of my techs shirts are now IB. i tried a different branD and i still come back for Icebreaker* I need to buy more and plan to use these on my TMB( Chamonix) 10 day hike in Aug /2025
5
RK
[ Great quality as always with Icebreaker. I use this shirt for Summer outings to avoid using too much sunscreen, yet keeps me cool enough.
5
Val
[ I have 2 previous versions sphere ii long sleeve t shirts that I wear on summer hike. I like them even if their material is not strong enough for hiking trips. one of them have a few small holes after laundry. this version seems to be stronger because material is thicker. another difference is sizing. I need M size in contrast of S size from previous version.
$85.00
The Small was spot on in every aspect. ... These shirts are ultra comfortable and can be worn as an undershirt or a T- shirt, sporting attractive graphics. ... Fantastic shirt for the intended purpose of repeated wears before
5
Aaron
[ Shirt is mostly as expected, soft and breathable, and odor resistant. I do wish the shirt was a little thicker so it 's less see- through( which would hopefully also help with making it more durable)
5
Mark G
I ’ ve used this shirt for touring this spring. It ’s kept me dry, cool and comfortable the whole way! I ’ m 5 ’ 11 ” and 170lbs and went with the medium which fits me well( not tight) but the sleeves feel a little short compared to my other shirts. I was leery of the passion color at first based on the photos but love the color in person now!
5
JG
[ The Merino Tech Lite II Short Sleeve T- Shirt is hands down one of the best t- shirts I 've owned. It 's lightweight, soft, and super versatile, making it perfect for everything from hiking to casual wear. Why I Love It: ✔ Soft& Comfortable- No itch, just smooth merino that feels great against the skin. ✔ Breathable& Moisture- Wicking- Stays cool in warm weather and dries quickly. ✔ Odor- Resistant- Worn it multiple times between washes, and it still smells fresh. ✔ Great Fit& Versatility- Works well as a standalone tee or a base layer. A Couple of Considerations: ⚠ Fabric is lightweight, so be mindful of snags. ⚠ A bit pricey, but the quality and durability make it worth it. If you 're looking for a high- quality merino t- shirt that 's comfortable, breathable, and perfect for any occasion, this one 's a winner. I 'll definitely be buying more!
5
Dee
[ Just reviewed the long sleeve base layer, and like both of these tops. Since it is still winter in Colorado, I have been wearing the short sleeve T- shirt on the 65 degree days we sometimes have. I also like to wear the men 's as opposed to the ladies for the looser fit.
5
Geoff
[ I love these icebreaker shirts. I own several in different colors, prints, etc. Very breathable and comfortable. No chafing or scratching on my chest. I 've had issues with other Mfg products on this front. With good care I 've found these to last a while( i. e. line dry only).
$85.00
classic fit t- shirt to wear on any adventure you can think of soft merino fibers regulate body temperature in all weather conditions and naturally resist odors offset shoulder seams prevent friction graphic on front
5
Aaron
[ Shirt is mostly as expected, soft and breathable, and odor resistant. I do wish the shirt was a little thicker so it 's less see- through( which would hopefully also help with making it more durable)
5
JG
[ The Merino Tech Lite II Short Sleeve T- Shirt is hands down one of the best t- shirts I 've owned. It 's lightweight, soft, and super versatile, making it perfect for everything from hiking to casual wear. Why I Love It: ✔ Soft& Comfortable- No itch, just smooth merino that feels great against the skin. ✔ Breathable& Moisture- Wicking- Stays cool in warm weather and dries quickly. ✔ Odor- Resistant- Worn it multiple times between washes, and it still smells fresh. ✔ Great Fit& Versatility- Works well as a standalone tee or a base layer. A Couple of Considerations: ⚠ Fabric is lightweight, so be mindful of snags. ⚠ A bit pricey, but the quality and durability make it worth it. If you 're looking for a high- quality merino t- shirt that 's comfortable, breathable, and perfect for any occasion, this one 's a winner. I 'll definitely be buying more!
5
Dee
[ Just reviewed the long sleeve base layer, and like both of these tops. Since it is still winter in Colorado, I have been wearing the short sleeve T- shirt on the 65 degree days we sometimes have. I also like to wear the men 's as opposed to the ladies for the looser fit.
5
Geoff
[ I love these icebreaker shirts. I own several in different colors, prints, etc. Very breathable and comfortable. No chafing or scratching on my chest. I 've had issues with other Mfg products on this front. With good care I 've found these to last a while( i. e. line dry only).
5
FunkyCity
[ My dad loves these shirts and is a committed fan! Thanks Icebreaker
$85.00
It's the words greatest super shirt. ... Awesome shirt ... But they 're perfect. ... Not literally, but they do last a long time and look/feel great. ... They 're perfect. ...
5
Aaron
[ Shirt is mostly as expected, soft and breathable, and odor resistant. I do wish the shirt was a little thicker so it 's less see- through( which would hopefully also help with making it more durable)
5
JG
[ The Merino Tech Lite II Short Sleeve T- Shirt is hands down one of the best t- shirts I 've owned. It 's lightweight, soft, and super versatile, making it perfect for everything from hiking to casual wear. Why I Love It: ✔ Soft& Comfortable- No itch, just smooth merino that feels great against the skin. ✔ Breathable& Moisture- Wicking- Stays cool in warm weather and dries quickly. ✔ Odor- Resistant- Worn it multiple times between washes, and it still smells fresh. ✔ Great Fit& Versatility- Works well as a standalone tee or a base layer. A Couple of Considerations: ⚠ Fabric is lightweight, so be mindful of snags. ⚠ A bit pricey, but the quality and durability make it worth it. If you 're looking for a high- quality merino t- shirt that 's comfortable, breathable, and perfect for any occasion, this one 's a winner. I 'll definitely be buying more!
5
Dee
[ Just reviewed the long sleeve base layer, and like both of these tops. Since it is still winter in Colorado, I have been wearing the short sleeve T- shirt on the 65 degree days we sometimes have. I also like to wear the men 's as opposed to the ladies for the looser fit.
5
Geoff
[ I love these icebreaker shirts. I own several in different colors, prints, etc. Very breathable and comfortable. No chafing or scratching on my chest. I 've had issues with other Mfg products on this front. With good care I 've found these to last a while( i. e. line dry only).
5
FunkyCity
[ My dad loves these shirts and is a committed fan! Thanks Icebreaker
$85.00
Look forward to adding other colors to the collection. ... Standard merino wool, does n't stink, leave it to air out and it's fine. ... High Quality Everyday
5
Aaron
[ Shirt is mostly as expected, soft and breathable, and odor resistant. I do wish the shirt was a little thicker so it 's less see- through( which would hopefully also help with making it more durable)
5
JG
[ The Merino Tech Lite II Short Sleeve T- Shirt is hands down one of the best t- shirts I 've owned. It 's lightweight, soft, and super versatile, making it perfect for everything from hiking to casual wear. Why I Love It: ✔ Soft& Comfortable- No itch, just smooth merino that feels great against the skin. ✔ Breathable& Moisture- Wicking- Stays cool in warm weather and dries quickly. ✔ Odor- Resistant- Worn it multiple times between washes, and it still smells fresh. ✔ Great Fit& Versatility- Works well as a standalone tee or a base layer. A Couple of Considerations: ⚠ Fabric is lightweight, so be mindful of snags. ⚠ A bit pricey, but the quality and durability make it worth it. If you 're looking for a high- quality merino t- shirt that 's comfortable, breathable, and perfect for any occasion, this one 's a winner. I 'll definitely be buying more!
5
Dee
[ Just reviewed the long sleeve base layer, and like both of these tops. Since it is still winter in Colorado, I have been wearing the short sleeve T- shirt on the 65 degree days we sometimes have. I also like to wear the men 's as opposed to the ladies for the looser fit.
5
Geoff
[ I love these icebreaker shirts. I own several in different colors, prints, etc. Very breathable and comfortable. No chafing or scratching on my chest. I 've had issues with other Mfg products on this front. With good care I 've found these to last a while( i. e. line dry only).
5
FunkyCity
[ My dad loves these shirts and is a committed fan! Thanks Icebreaker
$95.00
machine wash ... soft merino fibers regulate body temperature in all weather conditions and naturally resist odors offset shoulder seams prevent friction shirt can be worn tucked or untucked screen printed graphic at
5
Aaron
[ Shirt is mostly as expected, soft and breathable, and odor resistant. I do wish the shirt was a little thicker so it 's less see- through( which would hopefully also help with making it more durable)
5
JG
[ The Merino Tech Lite II Short Sleeve T- Shirt is hands down one of the best t- shirts I 've owned. It 's lightweight, soft, and super versatile, making it perfect for everything from hiking to casual wear. Why I Love It: ✔ Soft& Comfortable- No itch, just smooth merino that feels great against the skin. ✔ Breathable& Moisture- Wicking- Stays cool in warm weather and dries quickly. ✔ Odor- Resistant- Worn it multiple times between washes, and it still smells fresh. ✔ Great Fit& Versatility- Works well as a standalone tee or a base layer. A Couple of Considerations: ⚠ Fabric is lightweight, so be mindful of snags. ⚠ A bit pricey, but the quality and durability make it worth it. If you 're looking for a high- quality merino t- shirt that 's comfortable, breathable, and perfect for any occasion, this one 's a winner. I 'll definitely be buying more!
5
Dee
[ Just reviewed the long sleeve base layer, and like both of these tops. Since it is still winter in Colorado, I have been wearing the short sleeve T- shirt on the 65 degree days we sometimes have. I also like to wear the men 's as opposed to the ladies for the looser fit.
5
Geoff
[ I love these icebreaker shirts. I own several in different colors, prints, etc. Very breathable and comfortable. No chafing or scratching on my chest. I 've had issues with other Mfg products on this front. With good care I 've found these to last a while( i. e. line dry only).
5
FunkyCity
[ My dad loves these shirts and is a committed fan! Thanks Icebreaker
$85.00
Same magnificent quality, fit, and
5
Aaron
[ Shirt is mostly as expected, soft and breathable, and odor resistant. I do wish the shirt was a little thicker so it 's less see- through( which would hopefully also help with making it more durable)
5
JG
[ The Merino Tech Lite II Short Sleeve T- Shirt is hands down one of the best t- shirts I 've owned. It 's lightweight, soft, and super versatile, making it perfect for everything from hiking to casual wear. Why I Love It: ✔ Soft& Comfortable- No itch, just smooth merino that feels great against the skin. ✔ Breathable& Moisture- Wicking- Stays cool in warm weather and dries quickly. ✔ Odor- Resistant- Worn it multiple times between washes, and it still smells fresh. ✔ Great Fit& Versatility- Works well as a standalone tee or a base layer. A Couple of Considerations: ⚠ Fabric is lightweight, so be mindful of snags. ⚠ A bit pricey, but the quality and durability make it worth it. If you 're looking for a high- quality merino t- shirt that 's comfortable, breathable, and perfect for any occasion, this one 's a winner. I 'll definitely be buying more!
5
Dee
[ Just reviewed the long sleeve base layer, and like both of these tops. Since it is still winter in Colorado, I have been wearing the short sleeve T- shirt on the 65 degree days we sometimes have. I also like to wear the men 's as opposed to the ladies for the looser fit.
5
Geoff
[ I love these icebreaker shirts. I own several in different colors, prints, etc. Very breathable and comfortable. No chafing or scratching on my chest. I 've had issues with other Mfg products on this front. With good care I 've found these to last a while( i. e. line dry only).
5
FunkyCity
[ My dad loves these shirts and is a committed fan! Thanks Icebreaker
$80.00
our most versatile tech t- shirt that provides comfort, breathability and odor- resistance for four seasons' worth of adventure 100% merino fibers regulate body temperature and naturally resist odor regular fit; can be worn by itself or over other
5
Aaron
[ Shirt is mostly as expected, soft and breathable, and odor resistant. I do wish the shirt was a little thicker so it 's less see- through( which would hopefully also help with making it more durable)
5
JG
[ The Merino Tech Lite II Short Sleeve T- Shirt is hands down one of the best t- shirts I 've owned. It 's lightweight, soft, and super versatile, making it perfect for everything from hiking to casual wear. Why I Love It: ✔ Soft& Comfortable- No itch, just smooth merino that feels great against the skin. ✔ Breathable& Moisture- Wicking- Stays cool in warm weather and dries quickly. ✔ Odor- Resistant- Worn it multiple times between washes, and it still smells fresh. ✔ Great Fit& Versatility- Works well as a standalone tee or a base layer. A Couple of Considerations: ⚠ Fabric is lightweight, so be mindful of snags. ⚠ A bit pricey, but the quality and durability make it worth it. If you 're looking for a high- quality merino t- shirt that 's comfortable, breathable, and perfect for any occasion, this one 's a winner. I 'll definitely be buying more!
5
Dee
[ Just reviewed the long sleeve base layer, and like both of these tops. Since it is still winter in Colorado, I have been wearing the short sleeve T- shirt on the 65 degree days we sometimes have. I also like to wear the men 's as opposed to the ladies for the looser fit.
5
Geoff
[ I love these icebreaker shirts. I own several in different colors, prints, etc. Very breathable and comfortable. No chafing or scratching on my chest. I 've had issues with other Mfg products on this front. With good care I 've found these to last a while( i. e. line dry only).
5
FunkyCity
[ My dad loves these shirts and is a committed fan! Thanks Icebreaker
$85.00
versatile tech tee that provides comfort, breathability and natural odor- resistance for any adventure you can think of soft merino fibers regulate body temperature in all weather conditions and naturally resist odor offset shoulder seams to prevent
5
Aaron
[ Shirt is mostly as expected, soft and breathable, and odor resistant. I do wish the shirt was a little thicker so it 's less see- through( which would hopefully also help with making it more durable)
5
JG
[ The Merino Tech Lite II Short Sleeve T- Shirt is hands down one of the best t- shirts I 've owned. It 's lightweight, soft, and super versatile, making it perfect for everything from hiking to casual wear. Why I Love It: ✔ Soft& Comfortable- No itch, just smooth merino that feels great against the skin. ✔ Breathable& Moisture- Wicking- Stays cool in warm weather and dries quickly. ✔ Odor- Resistant- Worn it multiple times between washes, and it still smells fresh. ✔ Great Fit& Versatility- Works well as a standalone tee or a base layer. A Couple of Considerations: ⚠ Fabric is lightweight, so be mindful of snags. ⚠ A bit pricey, but the quality and durability make it worth it. If you 're looking for a high- quality merino t- shirt that 's comfortable, breathable, and perfect for any occasion, this one 's a winner. I 'll definitely be buying more!
5
Dee
[ Just reviewed the long sleeve base layer, and like both of these tops. Since it is still winter in Colorado, I have been wearing the short sleeve T- shirt on the 65 degree days we sometimes have. I also like to wear the men 's as opposed to the ladies for the looser fit.
5
Geoff
[ I love these icebreaker shirts. I own several in different colors, prints, etc. Very breathable and comfortable. No chafing or scratching on my chest. I 've had issues with other Mfg products on this front. With good care I 've found these to last a while( i. e. line dry only).
5
FunkyCity
[ My dad loves these shirts and is a committed fan! Thanks Icebreaker
$75.00
Great lightweight merino for summer ... lightweight and breathable cool- lite fabric blend is designed to wick moisture away from the body side splits at hem for added ventilation and mobility offset shoulder seams to prevent friction droptail hem for added
5
Amir
[ I 'm really impressed with this T- shirt. The quality is top- notch, the fabric feels incredibly soft, and the fit is just right. it hugs the body without being too tight. It definitely complements my look, especially when I 'm at the gym. If you want a shirt that looks good, feels good, and holds up well, this one 's a solid pick.
5
Steve
[ This is my new favorite base t- shirt. It works great layering and can stand on its own!
5
Don Vogel
[ I hope Icebreaker makes more shirts like this, it has a bit of a tail that stays tucked into my pants. If I could find more on your website, I would buy a lot more. I buy almost all my shirts from Icebreaker!
5
JG
[ The Merino Blend 125 Cool- Lite™ Sphere Short Sleeve T- Shirt is easily one of the best t- shirts I 've owned. It 's soft, breathable, and perfect for warm weather or layering under a jacket. What I Love: ✔ Lightweight& Comfortable- The Cool- Lite™ fabric feels soft, never itchy, and is great for all- day wear. ✔ Breathable& Moisture- Wicking- Keeps me cool, dries quickly, and does n't get sticky, even in humid conditions. ✔ Odor- Resistant- I 've worn it multiple times without washing, and it still smells fresh- perfect for travel. ✔ Versatile Fit- Works great for hiking, workouts, or casual wear. Looks good enough to wear anywhere. A Few Things to Note: ⚠ The fabric is delicate, so avoid rough surfaces to prevent snags. ⚠ It 's not the cheapest, but the comfort and performance are worth it. If you 're looking for a lightweight, breathable, and high- quality merino blend t- shirt, this one is a great choice. I 'll definitely be getting more!
5
KP
[ Love this shirt. It 's so comfortable and breathable. It is pretty lightweight so not the most durable.
See Price in Cart
WAS: $125.00*
relaxed fit made with four way stretch for unlimited movement moisture transfer fibers move moisture away from skin to keep you dry upf 30 protection clima- wool fabrics boast superb breathability and temperature regulation for a comfortable
$100.00
slim fit can be worn as a baselayer or as is crewneck for easy on and off soft and breathable material with cooling feel flatlock seams to help seal in heat single- jersey fabric soft, lightweight material will keep you comfortable all day long longer in back, the curved hem keeps...
5
Nikki12
Very comfortable shirt highly recommended by a size bigger as they run small
5
Dark55
Very light and weight and easy to move around in it
5
Matt09
Great shirt stands out in every way possible very light just had to upsize a size
5
Joey
I ’ m a taller guy and kinda of thinner but this shirt fit me perfect. Also hugged my chest really well and made me feel like a specimen. It ’s a bit expensive for base layer but I will be buying more of these for sure.
5
Wandabelle
He loves the gift and been wearing it in the summer when not too hot. Material is great quality.
$55.00
Super cool shirt fits good and good for cold weather ... long sleeves crewneck rounded hem gives you extra coverage for your stretching routines and all your multi- direction movements added length helps the top stay tucked in mesh panels on the back and under the arms add ventilation and keep you...
5
Tina1000
My teenage boy wears this top to keep him warm while playing lacrosse and football in cold weather. It is very comfortable and is a great addition to his uniform.
5
Pinky888
Keeps my son warm on chilly days outside. Used primarily under his baseball uniform on cooler days. Comfortable and washes well. True to Nike size, close fitting to the body but not tight.
5
MVB17
My son loves this long sleeve and it ’s been perfect for the gym too
5
LuckyTX247
Recently bought and it was more than what I expected. This does keep me warm especially if you use it under a shirt. I went a size bigger just in case. The fitment was well with a bit extra room.
5
Cbutgo
Great shirt!! Fits great, keeps you warm!! Very happy!!
See Price in Cart
WAS: $115.00*
Perfect base for a layering system ... This shirt was so soft and comfortable. ... Just enough to keep me nice and warm without being too overbearing. ... Warm and
5
Patches
[ Needed a thicker base layer for skiing on those colder days. Perfect addition.
5
Captain Jimmy
[ This base layer is really comfortable. It is warm and does not restrict movement. I wish I had found this earlier. Fit is true to size. I 'm not sure why anyone would not be happy with this- buy it!
5
Jbear
[ Merino is THE stuff for active comfort in the cold. The key is staying dry between rain, snow, and sweat... it 's challenging. 100%( 95 and 88 also good) merino helps to achieve this goal. It 's warm when you need it to be and water( all types) evaporates quickly to keep you from getting chilled from damp clothing. It 's got to be part of a system though, and you have to use that system properly or you will get damp and cold. We just came back from five nights in our tent@ an avg. of 26F at night. After hiking all day in these and then, putting on fresh Smartwool tops and bottoms we were warm all night( we could have stayed in the same set if we had to). Medium weight is probably fine for most applications, but do be sure you 've got the right system for the conditions. In summer and spring it 's less critical, but in winter( THE best time IMO)... having the wrong gear can make for a miserable experience... and a dangerous one. Smartwool has the added benefit of being able to go in the dryer at home... not all merino products can. That 's my take.
5
JKNOR
[ When it comes to staying warm during the winter, base layers are KEY! My old Smartwool long- sleeve lasted me years of use. Loved my first one so much that when it came to finally replace it, it was a no brainer. Kept me comfortable and warm during winter months of New Zealand, Japan, all the way to the summit of Mauna Kea. I 've never had a base layer fit so good right off the shelf. Felt like it I was putting on my favorite tshit. Could n't recommend it more
5
Sheri
[ My son loved the wool sweater I bought him for Christmas. It was soft and warm at same time. Mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm
$100.00
knit™- engineered body mapped technology? to regulate your body temperature and? let your skin breathe during high- intensity activity cool- lite™- a lightweight and breathable fabric blend raglan sleeve construction for mobility gusseted underarms for mobility and comfort thumb...
5
Mark
[ I am getting synthetic products out of my wardrobe and I have become addicted to Icebreaker long sleeve layering shirts. They are extremely comfortable, come in a variety of nice colors and weights, so are quickly replaced my synthetic top layers.
5
The Greek
[ This is one of two or three of the most amazing clothes I have. Technically it 's a base layer but it 's something I wear almost anywhere with the right pants and shoes. It 's wool, but it 's incredibly soft and comfortable. It works great as a base layer, but it 's versatile.
5
Fredrick
[ This color is perfect, very beautiful and should be used again and again. Ideal light weight garment for fitness. Very breathable.
$160.00
I picked this up for an upcoming trip and have ended up wearing on cool training runs, in the office and it will be my go to travel layer. ... realfleece™ brushed merino wool provides warmth and softness next- to- skin cool- lite™ breathable and lightweight fabric...
5
John
[ I do n't usually write reviews but this is a great product. I wear it under a bike jacket and it keeps me so warm. Totally worth it.
5
K
[ I picked this up for an upcoming trip and have ended up wearing on cool training runs, in the office and it will be my go to travel layer. It works well without roasting me when it warms up.
4
JF
[ Super comfortable and perfect layer. I wish the sleeves were a little longer
$90.00
Nice lightweight shirt ... knit™- engineered body mapped technology? to regulate your body temperature and? let your skin breathe during high- intensity activity features cool- lite™, a lightweight and breathable fabric blend raglan sleeve construction for mobility...
5
Chuck
[ Really love the shirt. It looks an feels great. I like everything that I 've bought from Icebreaker.
5
Max
[ No merino wool company compares to that of icebreaker. It feels fantastic while still maintaining all the qualities of merino. I have no complaints about this shirt.
5
BJ
[ Bought this shirt to run in and it 's great. Comfortable fit, true to size and dries quickly when the sweat gets going.
5
JJJL
[ blending with TENCEL making it more comfortable, also no funky smell in the summer.
5
B
[ I play ping pong with it, sleep with it, and wear it several times a week without washing it.
$130.00
Great layer piece as well as a dress look under the Men's Intraknit™ Merino Sport Fleece Full Zip Hoodie. The hand and softness of this fabric brings Smartwool back into the top of the line
$35.23-$69.99
WAS: $95.00*
I ’ m 6ft 175 and I ordered an xl bc I like the loose baggy fit and this shirt is a perfect fit. ... the engineered fabric offers more breathability in high- sweat
5
christiang775209896
I ’ m 6ft 175 and I ordered an xl bc I like the loose baggy fit and this shirt is a perfect fit. Waiting for more colors
$110.00
I bought this for my son for Christmas- he had asked for a lightweight quarter zip. ... fit and design light and comfortable fleece sweater with half- length zipper great as mid layer, or a first layer in warmer climates made from recycled...
5
Rob
Well made, great fit, would definitely buy another
5
Ryan
High quality material that hasn ’ t pilled after a year of use and washing. It ’s long enough for my 6 ’ 5 ” frame. I have the half zip and full zip, and they are worn regularly. I wear them to work and in the outdoors. Great for hiking. They ’ re lightweight enough to wear when you ’ re sweating, but warm enough for when it cools down.
5
YanniM619
[ Super comfy midlayer and kept me warm down to about 50°F and stylish to boot so super happy with my purchase! Only thing I can gripe about is no chest pocket but a different model probably has one.
5
Boy mom
[ I bought this for my son for Christmas- he had asked for a lightweight quarter zip. This fleece was perfect- we loved the color and style. It was a perfect weight and great quality.
$24.99
driven by performance: polyester lightweight interlock fabric manages cool air without creating excess bulk moisture- wicking, antimicrobial fabric minimizes sweat accumulation to keep you dry fit profile: athletic fit crew
5
gkksjdshhdshe
I got it for my grandsons birthday and he loves it
$30.00
I purchased the dri- fit shirt and it works great while running and cycling. ... Fits good and very comfortable. ... Comfortable fit ... regular fit nike dri- fit technology moves sweat away from your skin for quicker evaporation, helping you stay dry and comfortable knit fabric feels soft and...
5
Kellyvt
Quality shirt, holds up over time. Solid compression. My son loves these shirts
5
Sport enthusiast
I bought these for my husband. He felt he needed to size up. He usually wears an XL, but not this time. Slimmer fit than what he is used to. He ’s 6 ’ 4 ”, over 200 pounds.
5
cerdanoel
This shirt is great for working out or just in general, especially if you are looking for a light shirt
5
Dicksupport22
Perfect fit and function. Great quality. Son loves it.
5
jwils004
Great fit, great feel. Perfect for lifting or sports.
$35.00
I got the large size/ slim fit and this is perfect for my body frame with just less than an inch of room around my trunk. ... Bought a month ago for my gson to wear while playing football, it ’s a great comfortable fit, he wears it every game
5
ned113
I bought this nearly a month ago and happy that I did! Great fit, and allows me to move freely. I wear it while working out at the gym.
5
4dew4
I was in need of a white base layer that night for my son. This was the smallest option in any brand available for immediate pickup in store. It ’s too big, but was adequate and didn ’ t complain.
5
Sportsgma
Grandson loves this shirt, it 's the second one I bought for him. He likes the fit best compared to other compression shirts.
5
dwmay17
this is great for base layers. use while I am skiing.
5
Bballmom08
Bought for my Senior kid, and he loves it for baseball evenings
$110.00
light and comfortable fleece sweater with half- length zipper discreet thumbholes integrated into cuffs great as mid layer, or a first layer in warmer
5
Rob
Well made, great fit, would definitely buy another
5
Ryan
High quality material that hasn ’ t pilled after a year of use and washing. It ’s long enough for my 6 ’ 5 ” frame. I have the half zip and full zip, and they are worn regularly. I wear them to work and in the outdoors. Great for hiking. They ’ re lightweight enough to wear when you ’ re sweating, but warm enough for when it cools down.
$110.00
They are very comfortable and made with excellent quality. ... Nice fit and feel ... Excellent buy. ... My wife loves the fit and feel. ... stitched on adidas terrex woven branding made with natural and renewable materials as part of our journey to design out finite resources and help end plastic...
$30.00
Great layer under sports jerseys. ... Love this as my under sports layer! ... Fits perfect, super comfortable, looks great. ... Both my sons always wear their men ’s under armour heat gear under their pads for every football
5
Merle Henry
Son absolutely loves his UA and these compression fits! This is one of a few and had many overs years, but out grows them! I think he ’s finally stabilized at 6 ’ 6 ”, so we ’ ll see how long one lasts…😂🤣 Thanks UA for a great product!
5
JonRule336
I bought this for my 11 year olds to keep their shoulders in check during games and practices. These fit like a glove and have a really tough look to them!
5
Amp1190977
Fits true to size and it feels great on and keeps the
5
Bpm2211
One of the best compression shirts my child has. Very well made.
5
Mario529
This compression is perfect for my football trainings and gym workouts. I highly recommend
$80.00
fit and design slim fit is intended to follow the contours of the body lightweight merino jersey fabric uses a nylon core to increase durability while still keeping 100% merino wool next to skin 88% merino wool, 12%
5
Matt
[ This is great wool shirt. I have issues with itchy wool clothes, but Smartwool has always been non- itchy. This continues that tradition. Also very breathable, absorbent and does n't stink!
$75.00
fit and design this ultra- lightweight, super- soft, blended merino and tencel performance fabric is designed to help you stay cool and comfortable when you work up a sweat odour- resistant offset shoulder and side seams designed to increase comfort and minimize chafing reflective...
$48.99
WAS: $50.00*
Been looking for that well fitting and comfortable layer that will keep my kid warm during winter workouts and in early spring on the baseball field. ... Sometimes I have baseball games in the morning and this cold gear long sleeve shirt works wonders for those cold
5
IUBob
Under Armour has no rival in the category of cold weather gear. Their ColdGear is simply the best.
5
Langus
Love the style and as a big guy the fit was what I expected
5
Mymy00
Grandson is very pleased with this shirt plan on buying another
5
Baseballparent1
[ Been looking for that well fitting and comfortable layer that will keep my kid warm during winter workouts and in early spring on the baseball field. Just ordered several more.
5
Ray88
[ Sometimes I have baseball games in the morning and this cold gear long sleeve shirt works wonders for those cold mornings
$30.00
Cool compression without construction ... This is a good balance between UA quick- drying tech fabric and light compression to keep things stable while in
5
Juanito125krew
Great fit, lost some weight and feel great. Wish they were cheaper but I ’ m already looking at different colors!
5
Samuel T
I am 50 years old and I 've used under shirts off and on throughout my life. A few years ago I discovered the UA HeatGear and now I have wear them all the time- I can not go out if I do n't. I do n't feel comfortable if I 'm dot have my HeatGeaar on. I have them in many different colors and have lots of them so that I always have one to wear.
5
Ordered the medium per the size chart and it fit perfect. Just the right amount of compression. Worked out and the wicking effect was good.
5
ThatzSoRush
Have. been looking for additional colors to add to my daughters collection she has to wear a scoliosis back brace everyday. The men ’s S sleeveless compression shirts are long enough for her in the torso as the brace goes down to her hips. The women ’s aren ’ t long enough.
5
Lioness75
Bought this for my son who plays basketball. He wears it under his uniform and reports it is comfortable for practice and games.
$22.48-$55.00
WAS: $55.00*
My son used this shirt for soccer and it was perfect for those colder nights! ... nike® dri- fit technology moves sweat away from your skin to help you stay dry and
5
Fin10win
This has replaced all other gear as my favorite workout shirt for anytime except summertime...
5
mcsarah2019
Length and fit were great. Was true to size and did not shrink
5
Scott 905
I use this shirt underneath my hoodie during winter snow removal. I like how warm and dry I feel after any cold weather activity.
5
Travels
Great base layer for cold days on the track. Fits great!
5
Joe gifts
Love the material. It definitely keeps you warm. I ’ ll be ordering more
$65.00
omni- wick ... product class: knit top hz merchandise collection: trail running product line: sportswear product type: knit
See Price in Cart
WAS: $155.00*
meet the men's intraknit™ thermal max merino base layer 1/4 zip. ... this bulk- free, 100% merino wool thermal layer brings a new dimension to active winter
$35.00
great comfy shirt ... My son bought this long sleeve he states it ’s very comfortable great quality and is true to size. ... Great for cool fall nights ... It kept him warm and didn ’ t get in the way playing
5
ElectroswingFan76
There 's no surprises with this heat gear... form- fitting, moisture wicking, and washes easily with no fuss. Could n't be happier!
5
Nickczi
Great but fits very tight needed to return
5
Len Len
I have several colors and would love for UA to make orange and sky blue with the matching leggings. A very comfortable piece of clothing. Whether you are walking, running or bike riding this UA product works. It washes well and does not lise shape like other brands.
5
CAC2025
Very snug, but comfortable fit. Stitching seems to be holding up very well.
5
FrancisSD
From my experience, Under Armour has the best compression shirt. Other brands have compression shirts, but UA ones last longer and stay in the compression form much longer. I continuously buy different colors and lengths since I wear UA compression shirts to the gym most days.
$109.00
It's a perfect base layer for resort and backcountry skiing. ... A great base layer ... Great base layer ... Super comfortable and lightweight, seams do n't restrict
5
These are really good. Very comfortable to the skin across wide temperature range
5
Kenneth D
All the benefits of Merino wool with the strength of nylon. I definitely recommend this if you are a one bag traveler.
5
Hans
Super comfortable and lightweight, seams do n't restrict movement
5
LC
I wore this the day after I bought it and it was great. Temp was around- 5 Celsius and I used it as a base layer. Kept me warm and comfortable.
5
B
So far I have used it for resort and backcountry skiing and it has worked perfectly for me. I am 6' 1 '', 170lbs and the L fits well.
$40.00
slim fit short sleeve round neckline soft jersey clothing layer: first layer, insulating layer ... lightweight short- sleeved t- shirt in a soft jersey knit made from merino wool and recycled
$65.00
a perfect first layer in both warm and cold climates, and extra useful on multiday trips as wool naturally resists bad odours. ... The super soft merino wool fabric helps wick moisture and keeps me smelling fresh while I 'm out on the trail and wo n't stink after a long day, it...
5
lukasz1979
Nice material, better than other merino T- shirst I got in the past, including Icebreaker. I bought one more Abisko Wool T- shirt right away.
5
Axel
Best t- shirt around. Got in 3 colors and will buy more in a heartbeat should more colors come that suit me. Excellent flattering fit, really like the slightly longer arm that does n't ride up. Please add even more staple colors and v- neck options would
5
Lucas T.
This is the PERFECT shirt for warm weather trekking. The super soft merino wool fabric helps wick moisture and keeps me smelling fresh while I 'm out on the trail and wo n't stink after a long day, it also helps keep me cool. I wish more brands would recognize the amazing properties of wool, it 's not just for winter!
$60.00
Breathable lightweight T- shirt ... Pros: more lightweight, breathable, soft, comfortable than the 150. ... On the other hand, as long as you are OK with that this might happen, it is a very comfy shirt and I 'll enjoy wearing it( holes, mending and
5
Georgi27
[ I 've been wearing it every day for last few weeks and it 's very comfortable, even though it 's wool it 's very soft and keeps body temperature at a perfect level.
5
JB3122
[ Bought two of these to wear under my mtb jerseys and they work fantastic. Dry out quick, keep sweat off me. I 'm 6' 1 '', weigh about 190 and wear a small and it fits just about perfect. I 'd for sure suggest sizing down at least 1 size if you 're using this as an undershirt.
5
Guidhaus
[ Working in the yard HARD, day after day, rinsing it in shower( no time to wash every day!)... stands up to it all and still says soft and cool.
5
Neil
[ Very glad to buy this ultralight t- shirt. Used it for several times and like it very much. Be careful of the size. I did one size down after reading others' comments.
5
Virgil
[ Material is soo soft, and the fit is spot on. Breathable, wicking, everything is as advertised. Have bought many items for my Appalachian trail trip this spring, this is one of my best buys. Love this shirt, love this company!
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