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Stay warm and stylish with our collection of thermal shirts, designed for ultimate comfort in cooler weather. Crafted from soft, breathable fabrics, these shirts provide excellent insulation while allowing for easy movement. Perfect for layering or wearing on their own, our thermal shirts come in various styles and fits to suit your personal taste. Whether you're heading outdoors or lounging at home, these versatile pieces are essential for your cold-weather wardrobe. Embrace warmth without sacrificing style with our selection of thermal shirts.
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WAS: $55.00*
The hoodie is thermal but lightweight and comfortable and can wear anywhere ... Great
5
MN19
The hoodie is thermal but lightweight and comfortable and can wear anywhere
$115.00
This shirt is so soft and warm! ... She loves it- Warm and cozy and fits like a glove! ... Material is so soft. ... It provides enough warmth without being bulky. ... Warm and
5
Track Mom
Material is so soft. It is also thicker than most other brand wool base layer tops I have bought. Smartwool is a great brand.
5
Raka
Fits well, comfortable and a breathable but warm base layer.
5
Valentine56
This shirt is so soft and warm! As a senior citizen, I get cold easily. Wearing this shirt to sleep in keeps me comfortably cozy.
5
Jill
This is a great product. I purchased one for myself on- line for Christmas, based on the previous smart wool base layer bought in the store in October 2024. The only problem is that the shoplifting tag was still on the product when I opened it on Christmas Day 2025. How Annoying!!!!!! Now I have to return the product. How about some quality control? This was a very unsatisfying purchase.
5
LT70
I bought this shirt about a month ago because it was on clearance. I have already used it a few times while cross- country skiing and it is great. It provides enough warmth without being bulky. I am satisfied with my purchase.
$10.48-$45.00
WAS: $45.00*
Really comfortable and good all purpose long sleeve. ... Awesome
4
Kc3023
Really comfortable and good all purpose long sleeve.
$115.00
Went skiing at altitude with this as my base layer and it kept me incredibly warm! ... It's a great color and it's comfortable. ... Perfect base layer! ... My husband loves
5
Just another white guy
Went skiing at altitude with this as my base layer and it kept me incredibly warm!
5
Enjoy
My husband loves it. It's a great color and it's comfortable.
$90.00
Comfortable fit, true to size and dries quickly when the sweat gets going. ... Great dor working out and very comfortable under a sweater for cooler days. ... Nice lightweight
5
Stinky
[ I recently purchased two of these shirts in different colors. Good breathability and wicking. Great dor working out and very comfortable under a sweater for cooler days.
5
CAL
[ The most comfortable shirt I own and I really enjoy the way the material feels. I also own the `` normal '' ZoneKnit shirts and I had problems with the fabric tearing easily. This has held up better.
5
B
[ I play ping pong with it, sleep with it, and wear it several times a week without washing it.
5
JJJL
[ blending with TENCEL making it more comfortable, also no funky smell in the summer.
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.
$92.00
I ’ m 5 ’ 2 ” and 140 pound and a medium fit great. ... I wore it under a ski jacket for snow skiing and it was super comfortable warm and fits great. ... [ Love
5
Bevshaffer
[ Love this. I wore it under a ski jacket for snow skiing and it was super comfortable warm and fits great. I ’ m 5 ’ 2 ” and 140 pound and a medium fit great.
$92.00
Warmth and comfort all day. ... Wouldn ’ t think of leaving without out this
5
Snowhound1701
[ If you ’ re even thinking of going up to the mountains to ski or snowboard for a few days you better have all the layers for any conditions. Unless you want to freeze or be sipping hot cocoa in the lodge while your crew are a ripping it up. There is no equal when it comes to this base layer. Warmth and comfort all day. This is the Cadillac. Wouldn ’ t think of leaving without out this top.
$159.99
I highly recommend the heated base layer for anyone that spends time outdoors in the winter. ... It ’s just the right amount of heat in the right places to make cold winter hunting trips much more
5
I started with the Action Heat socks, and had to add the base layer to my collection. It ’s just the right amount of heat in the right places to make cold winter hunting trips much more enjoyable. I highly recommend the heated base layer for anyone that spends time outdoors in the winter.
5
Motorcycle C.
I got this primarily for motorcycling in colder weather. It works great. I can wear this with my jacket and jacket liner and I do n't have to wear other layers. I 've only used it so far riding in 50 degree weather but it was warm enough I had to turn it down or off. I usually wear a large but wanted it to fit tighter so I got a medium. The medium fits great. I would say the medium fits me perfect where normally I would wear a large t- shirt or long sleeve. Not too tight but not loose. Have n't had long enough to know how long the battery would last but have used it for a couple hours switching between high and medium and still have battery left. Would definitely use while skiing, etc
5
Laura
Great service and reasonable delivery time, especially as a Christmas order. This base garment is very well made and sizing is perfect. Very pleased.
5
Joshua
I just got my base layer and wore it to walk the dog and it was cold and windy outside. Absolutely was warmer
5
Rodney
Heats your body very well, keeps the cold out, easy to use, must be cleaned gently, I use all the time when a must to be outside for a long duration.
$130.00
The garment care is oh so easy. ... Perfect Top for Layering orWearing Alone ... The styling is also extremely flattering. ... I love the length of the body and the
5
Camper at heart
[ The black cherry color is very flattering. I ordered based on true body measurements and the size chart resulting in a perfect fit. The styling is also extremely flattering. The neck is not too tight and not too loose. I love the length of the body and the sleeves. The garment care is oh so easy.
$39.99
I bought this for my daughter so she can stay warm in winter ... Great for cold
5
ATLMiddy
I bought this for my daughter so she can stay warm in winter
$100.00
It works great as a base layer, but it's versatile. ... It has a nice fit and is very lightweight. ... They are extremely comfortable, come in a variety of nice colors and weights, so are quickly replaced my synthetic top
5
Jag26
Like the feel of this LS tee. Can use it as a base layer or by itself on cooler days. I personally used it for an outdoor run and felt great. One thing though… while the fabric is intended to wick sweat out, I did notice the tee being soaked so not sure I ’ ll be taking it out for runs again. The length of the tee is also a little short so consider that if interested in this shirt.
5
Fredrick
[ This color is perfect, very beautiful and should be used again and again. Ideal light weight garment for fitness. Very breathable.
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
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
Zack
[ I mostly wear this shirt for sun protection when i ride my bike on hot days. It has a nice fit and is very lightweight.
$41.28-$61.99
WAS: $88.00*
Super comfy and soft! ... Great for lounging around and wearing out. ... It drapes well and it's not cut too long. ... Soft with good structure and fit. ... Perfect Waffle
5
Gus
Probably the best waffle crew I have ever had. Soft with good structure and fit. It drapes well and it's not cut too long. I like them so much I bought three more. Great for lounging around and wearing out. Highly recommended. Please make more colors!
5
Zack T.
Fantastic product, as always! Super comfy and soft!
5
Luke
Great shirts fits nicely. Great color too. Baggy enough to wear over a T- shirt if you run hot and it ’s not quite cold enough for a hoodie.
$130.00
Functional and stylish ... [ This is a quality built base layer and I 've worn it by itself or under a light jacket for plenty of warmth. ... It ’s form fitting and the multi panels really make it articulate with my
5
MoosejawDon
[ Feels light on the skin and is plenty warm. I would like a little more move/breath ability in the pits however I do not feel sweaty. Perfect base or mid layer
5
Timoby2k
[ This has become my new favorite baselayer. It ’s form fitting and the multi panels really make it articulate with my movements. I wear it as my only layer in damp mid thirty degree runs. Also looks good to wear on its own out and about.
4
Rory
[ This is a quality built base layer and I 've worn it by itself or under a light jacket for plenty of warmth. Be advised to go one size up, especially if you have an athletic muscular build. Fits close to skin, athletic cut for sure. Looks awesome.
$120.00
I am generally a small/medium( 5 ’ 7 ”, 125 lbs, athletic) and I ordered a small and it fit perfectly. ... The dark red color and the zipper make it cute enough to wear as a sweater, plus it ’s super comfy and
5
Hikeryogi
I love these for layering or just on their own. The dark red color and the zipper make it cute enough to wear as a sweater, plus it ’s super comfy and warm. I am generally a small/medium( 5 ’ 7 ”, 125 lbs, athletic) and I ordered a small and it fit perfectly. Medium was too wide in my underarms and too long. I live in Florida and use this for winter trips to NY and for winter hiking.
5
piapia
love the fit, very warm base layer. true to size. would repurchase
$39.99-$41.99
I like the long back of the shirt to cover my assets. ... Keeps Me Warm ... I wore this to the Eagles playoff game and I was very warm and comfortable ... This is great for the cold
5
Bthehostess
My daughter is really picky with fabrics that touch her skin. We needed compression shirts to wear under her soccer jersey this winter. She absolutely loves these compression shirts. A little pricey but def worth it. We will be purchasing a few more for her.
5
Figarohall
I wore this to the Eagles playoff game and I was very warm and comfortable
5
Tia111
This is great for the cold weather. I like the long back of the shirt to cover my assets.
$39.99
I bought this to wear skiing in Tahoe and it kept me nice and warm in 20 degree weather. ... They were soft and comfortable enough to wear around the base of the mountain when not skiing, and they kept me warm when was doing down the
5
CHutson
I bought this to wear skiing in Tahoe and it kept me nice and warm in 20 degree weather. I love how the back is longer and doesn ’ t ride up.
5
Meals
Bought these specifically to wear while skiing in the Rockies in Colorado in January. They were soft and comfortable enough to wear around the base of the mountain when not skiing, and they kept me warm when was doing down the slopes. Have no complaints about this shirt. It was perfect
4
Zephyr TX
I bought this for my teen to use as a base layer for skiing and sledding. It kept him dry and warm and fit him well. I bought a duofold base later too too and liked the duo fold a little better as far as stitch quality and material quality and the duofold material seemed a little thicker but I ’ m keeping this one too.
$120.00
Longer than anticipated but probably good for tucking in, though not the look I wanted. ... Nice quality, runs
$130.00
The color is very pretty and overall was a very comfortable base layer. ... It is the perfect weight and is useful all year round! ... They are a more snug fit, but not too
5
G Love
[ This top made me ski like an olympiad. Really, it's that good, so I 'm buying it in navy. My favorite underlayer by a long shot, I literally wore it every day of my last ski trip- 5 days in a row. Shhhh.
5
Jess13
[ I bought this about 3 weeks ago… to keep me warm on a climbing trip where we would encounter cooler weather! I have dressed it up, wore around the cabin and out for hikes. I highly recommend!
5
Laurie
[ I bought this several weeks ago and have worn it on several chilly( and hilly) NE dog walks. It provides a warm, yet breathable layer under my light down jacket. It fits very close to my body and adds very little bulk. I appreciate the generous sleeve length. I have yet to launder it as I wear it as a middle layer.
5
Bouldergirl
[ This is my favorite top for hiking. It is the perfect weight and is useful all year round! I wear it's a base layer in winter and a top layer in summer for cooler days. Best material ever!
5
MPOSH
[ These Smartwool shirts are some of my favorite. They are a more snug fit, but not too tight. The purple color is so pretty. Very happy with this purchase.
$130.00
[ I bought the Smartwool to keep me warm and comfortable on a 12 day trek in Nepal. ... Stylish and functional ... Excellent comfort and warmth ... It has a very comfortable feel and looks great as
5
rahoran53
[ I bought the Smartwool to keep me warm and comfortable on a 12 day trek in Nepal. The performance was outstanding and, as advertised, it was very breathable to keep me warm and even cool in the afternoons. It has a very comfortable feel and looks great as well.
5
LPaul
[ I was looking for wool thermal layer for my husband, who runs cold. Rather than settling on a bland look, I chose this colorblock version for its added style. While he does n't fill it out quite as nicely as the model(!), he looks great in it.
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