â
Optimize your performance with our collection of running base layer tops, designed to keep you comfortable and focused on your run. Crafted from moisture-wicking fabrics, these tops provide excellent breathability and temperature regulation, ensuring you stay dry and cool. The lightweight and form-fitting designs offer a second-skin feel, allowing for unrestricted movement. Ideal for layering, our running base layer tops are perfect for any weather condition, making them an essential addition to your running gear. Elevate your training experience with these versatile and functional pieces.
See Price in Cart
WAS: $115.00*
[ This Merino wool base layer shirt fits well, is comfortable, and provides the extra layer of warmth to keep me cozy. ... Warm, lightweight, doesn ’ t stink, comfortable to sleep in and definitely a base layer option for hikes should you want
5
gilllll
[ I bought this for a trip to Yellowstone national park. The color is a bit different from the photo in natural light. Less coral/orangish as I expected. A bit darker and a bit more pinkish. But it's still really pretty and of course warm and cozy as the other Smartwool 250 I owned.
5
Annie
[ I am addicted to smartwool 250 baselayers. They always keep me warm and hold up wash after wash. The material doesn ’ t pill at all. I wear them all fall and winter.
5
Connie
[ I purchased this and the smart wool 250 bottoms for camping/hiking. They are exactly what you think they are and do exactly what you want them to. Warm, lightweight, doesn ’ t stink, comfortable to sleep in and definitely a base layer option for hikes should you want one. I purchased the set on the mystery gift promo- 100% worth it. Value value value.
5
Ellen F
[ Best cozy layer ever. Bought crew and leggings. My walks in the cold weather are so much happier now! Easy to order and fast delivery. Recommend to anyone!!
5
limabean
[ Gave to my daughter for Christmas. She loves it! Large fit perfectly It is great fabric and perfect weight! Would purchase again! Would like it come in Navy.
$90.00
Not only do I look good because they fit beautifully but are lightweight; so I ’ m not bulky 😊 whether worn alone( burnt orange is hot 🔥) or layered under my sweater I ’ m warm and toasty…looking
5
T Oot
Just came back from Banff Canada and wore this base layer everyday. I was warm and dry in sero degree weather!
5
Wild Child
[ I rage- bought another one of these after a medical tech ruined the neckline of the first one during a procedure. Every time I want to put on something warm and reliably comfy, I reach for this top. I intend to buy one per year until I 've replaced every other base layer top I own. Very good quality, good feel to the fabric. I 'm fairly tall( 5'10 '') and the sleeves are long enough, and the body is long enough. So that's another thing.
5
Upshpr
[ For reference, I purchased a Medium. I ’ m 5 ’ 4 ”, 128 pounds, pear shaped, so, smaller on top, curvier on bottom. I got the black which is opaque. I wear this baselayer weight for cross country skiing when it ’s above 30 degrees or so. Smartwool varies in size for me, these are not extremely fitted like some of the 1/4 zips so go with your normal size.
5
KC123
[ I love this shirt. I recently got another few to fill up my wardrobe after a move from AZ to OR. I have had the originals for almost 9 years and wear them all winter long. I have been hiking, backpacking, and traveling with them and they have withstood the test of time. They are comfortable alone or as under layer. I additionally regularly wear it as a mid layer with a smartwool tank below. I truly love these shirts. If it helps, I wear an XS and am 5 ’ 2 ’ ’ and 120- 130lbs depending on the year.
5
Silvercurls
[ Bought my Smartwool Women's Classic All- Season Merino LS Base Layer Tops just in time for the cold weather in the “ D ”. Best referral from a friend ever! Not only do I look good because they fit beautifully but are lightweight; so I ’ m not bulky 😊 whether worn alone( burnt orange is hot 🔥) or layered under my sweater I ’ m warm and toasty…looking good! Not sweaty in this wool top; comfort is sexy, ok! Grabbing more for stocking stuffers 😊
See Price in Cart
WAS: $60.00*
It skims my body without hugging too tightly, the way Imprefer. ... Also enjoy the longer arm length for protection from the sun, ... It;s breathable, wicking, and keeps me cool in the summer
5
marilynintexas
I love the ease and comfort of the material. It fits TTS, and is attractive looking. It;s breathable, wicking, and keeps me cool in the summer heat. I prefer the stretchy movement of the material, and wish it came in more colors than black or purple. I love the black, but purple is too much for me! It skims my body without hugging too tightly, the way Imprefer. Would buy in 5 more colors if available. Also enjoy the longer arm length for protection from the sun,
$85.00
Very comfortable material and lightweight, perfect for running errands! ... Not too hot, not too cold ... Very Comfortable And Stylish Pullover ... Perfect for cool days with big
5
charlesp772116876
This thing is too good. Perfect for cool days with big climbs. Fully unzip and roll the sleeves up on the way up and then zip back up and roll the sleeves down for the way down.
5
3dyers
Love this half zip top! I know it ’s men ’s ’ but I ordered it in a small and it fits perfectly! Very comfortable material and lightweight, perfect for running errands! I wish there were some brighter color ways other than the light blue, but definitely thinking of getting the maroon one as well!
4
unchaec599543573
I really like the material and quality of this. But if you have a decent sized neck, it will be pretty tight
$71.97-$95.00
WAS: $90.00-$95.00*
It does run a little small, so I ’ d recommend going up a size for the perfect fit. ... The Playful Pink shade is even more stunning in person — soft, feminine, and eye- catching in the best
5
Racquel905080031
This jacket is absolutely gorgeous! The material feels high- quality, and it looks exactly like the photo. The Playful Pink shade is even more stunning in person — soft, feminine, and eye- catching in the best way. It does run a little small, so I ’ d recommend going up a size for the perfect fit. Overall, it ’s such a beautiful, stylish piece — definitely a must- have!
5
Cookie 88
I bought this a month ago and love it, wear it all the time and fits great!
5
Raebee2
Great fight, would buy in other colors. Lightweight.
$80.00
[ This cropped boxy tank is perfect for hot run days! ... Very light and comfortable ... [ The Speed Tank is cool and comfortable. ... I appreciate the high
5
VCS
[ This cropped boxy tank is perfect for hot run days!
5
Sal
[ After I bought one, I ran out and got another immediately I like it so much
5
Sarah G
This is the perfect tank for hot summer. I 've hiked and worked out in it and it's lightweight and breathable
5
Julez
[ The speed tank fits perfectly, I love how soft it is and it's great for all activities. I only bought one but I am planning on buying another or two.
4
Magnolia
[ I wear it under a long sleeve shirt for hiking in the summer. I got the white one, it is a little shear, but I love the cropped length. I wish icebreaker was written on the back rather than the front.
$59.99-$75.00
WAS: $75.00*
Great fit 1/2 zip for when I need a extra layer for cold walks in the morning. ... Great fit and comfort ... Love this 1/2 Zip for colder morning walks ... Comfortable and not skin
5
Duncanson1990
This shirt is fantastic. It ’s basically just a much needed upgrade version of the 1/2 zip elements. What I mean by that is the material is soft and comfortable and stretchy. The shirt also has a mesh ’s area running on the bottom of the arm that goes along the whole sleeve which is nice to help with cooling off. Also it seems to be lighter than the elements which helps it be a better choice to wear on warmer days. Hope these stick around and get more colors. I definitely recommend these especially if you were a fan of the 1/2 zip elements.
5
EvangelineG557620402
I can wear this from workouts to under my shirt. It keeps me cool and I haven ’ t overheated once. It ’s a good sports fit zip up/ good for daily life as well
5
Michael40133885
Very comfortable, fitting and shapes to your body.
5
Amango
I bought this to run a half marathon in when it was like 40 degrees. It was warm enough that I didn ’ t get cold in the beginning and breathable enough to not overheat once I got a couple miles in.
5
Dri shirt
A terrific value the fit is great and price reasonable
$85.00
Nice but fits small ... Nice different looking top but it fits me rather small even though I went up a size when
$15.58-$35.00
WAS: $35.00*
Great for an added layer without the heat. ... I needed a new compression shirt for track and this did just the trick! ... I would say that it has a thinner material feel, but once you put it on it feels really
5
Wldman Dan
I got this for a friend& she loves it.
5
Christole
So bought this for my teenage daughter. It was so nice an fit perfectly I went an purchased one for myself. It's close fitting to her body an she wears it a little to much but she loves it.
5
Lila25
Fits amazing and hugs your body in all the right places. True to size! Truly recommend it
5
Bails20000
True to size for a compression fit. Thinner than I expected but not see through. Great for an added layer without the heat. Going to layer it with a short sleeve shirt for sun protection
5
KinMarie
I love this top! I needed a new compression shirt for track and this did just the trick! The top is very comfortable and breathable. It also fit perfectly!( It's supposed to fit fairly snug so if you want it to be looser go a size or two up) I went off of the size chart! And it seems pretty accurate! I would say that it has a thinner material feel, but once you put it on it feels really nice. For reference here is my measurements! I ordered an XS Bust: 32 in Waist: 25 1/2 in Height: 5' 8
$12.58-$30.00
WAS: $30.00*
This Under Armour compression shirt makes workouts so much more comfortable! ... I love how this compresses you ... They are perfect and comfortable to workout
5
Mike F 21555
I bought this women's compression shirt for my 14 year old daughter to use during volleyball, but now, she wears it all the time!
5
The Boy Mom
Very fitted but extra comfortable top for just a casual fit or to exercise in.
5
GOAT 1203
Needed a short sleeved shirt that would be comfortable and wick sweat away during practice. This one did the job!
5
layla05111
i love this shirt fits great feels great i believe this was the heat press one but theres really no difference between the cold and heat press doesnt feel any different in my opinion
5
HBCUdrlibrarian
Beautiful shade of blue. Just right compression. Excellent fit
$28.00
Says it ’s very comfortable ... Comfy too! ... He wears with shorts or uses it for sports and finds it very comfortable and versatile ... Great shirt in lots of different
5
Allie001
My son loves this shirt. He chose it to wear on the first day of school and looked great! Comfy too!
5
Kimme76
Love the dry fit great for sport and working out
5
Csl65
My son loves this shirt under his pads. Says it ’s very comfortable
5
Jstrass
My son loves these compression shirts!
5
Grandmaof10
It feels good. And didn ’ t rub my armpits.
$35.07-$55.00
WAS: $55.00*
This Cold Gear fitted shirt is a great base layer. ... This Cold Gear fitted base layer shirt is perfect for those cooler days on the golf course or any outdoor
5
Veteran Scout
This is soft and keeps you warm.
5
Adirondack hunter
Shirt fits well and doesn ’ t ride up on mid section. Sleeves stay down at wrists. Fits well under outer layers without feeling bulky.
5
Donald Z
These are awesome. The fit and comfort is great. They keep me nice in warm in the changing weather.
5
Rob1975
This is a great layer with good fit& comfortable under varied weather conditions.
5
Jeffcorp
This is a great top for the warmer months. Very comfortable too
$55.00
Its the perfect base layer to keep me warm during the winter months in NJ. ... Love the feel of this against my skin. ... It fits great but most of all it keeps me
5
INYUK
Wow I have been looking for something like this for a while. This top is perfect. It fits great but most of all it keeps me warm. I really don ’ t have to wear anything more but a jacket over this to go to the gym. Thank you Under Armour for always providing top quality workout clothing.
5
Buckeyebabe11
The shirt seems like it ’s good quality and it fits as expected. I don ’ t really like the vented underarms because it ’s a darker shade of gray but that ’s the only thing I dislike about it.
5
Sb123321
Ordered the cold gear long sleeve for my daughter. Kept her warm playing soccer in the cold rain.
5
Goalie07
I wear this top to the gym, soccer practices, and under ski layers. It is a favorite and warm on really cold days.
5
Womens cold gear crew
I love this under armour womens cold gear crew…really keeps you warm…great fit…I ’ m tall and the sleeves are plenty long
$55.00
Great Base Layer ... Ilove how warm it is and how it ’s easy to layer. ... Great quality and comfortable fit. ... This is an excellent item for cold weather. ... This shirt is a great baselayer and kept me warm in- 25 F
5
David Beny
Love the fit and warmth of the product for cooler days while playing sports! Great flexibility in arms and comfortable feel!
5
Mike Ry15
Fits as advertised. Keeps you very warm. Comfortable and stylish at the same time. Definitely worth the price.
5
Ree56
love love love this mock neck top! Ilove how warm it is and how it ’s easy to layer. I also love how it covers my neck to block out the cold because it is very cold during this season.
5
Lucy10
This is an excellent item for cold weather. The fit is accurate to size and it works as described.
5
Dammbones
Great quality and comfortable fit.
A running base layer top is a fitted garment designed to be worn next to the skin during physical activities like running. It helps regulate body temperature by wicking moisture away from the skin, keeping you dry and comfortable. This is especially important during intense workouts or varying weather conditions, as it can enhance performance and prevent overheating.
Running base layer tops are typically made from moisture-wicking fabrics such as polyester, nylon, or merino wool. These materials are chosen for their ability to manage sweat, provide breathability, and offer comfort against the skin. Some tops may also include elastane for added stretch and flexibility, allowing for a full range of motion while running.
When selecting a running base layer top, look for a snug fit that allows for easy movement without being too tight. The top should feel comfortable against your skin, with enough stretch to accommodate your running style. Consider trying on different styles and sizes to find the best fit for your body type, as this can significantly impact your overall comfort during runs.
Yes, running base layer tops are versatile and can be worn in various weather conditions. In cooler temperatures, they provide insulation and warmth, while in warmer weather, they help wick moisture and keep you cool. Layering with other clothing items, such as jackets or shorts, can enhance their effectiveness in different climates.
When shopping for a high-quality running base layer top, consider features such as moisture-wicking properties, breathability, and comfort. Look for tops with flatlock seams to reduce chafing and irritation during runs. Additionally, some tops may offer UV protection or odor-resistant properties, which can be beneficial for outdoor running.
Running base layer tops are specifically designed to be worn as the first layer of clothing during physical activity, focusing on moisture management and temperature regulation. Unlike regular athletic shirts, they are typically made from specialized fabrics that enhance performance by keeping the body dry and comfortable. The fit is usually more snug to reduce bulk and improve aerodynamics while running.
Continue browsing
(5) 
