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Stay warm and comfortable with our collection of lightweight long underwear, designed for optimal layering in cooler weather. Crafted from breathable, moisture-wicking fabrics, these essentials provide warmth without the bulk, making them perfect for outdoor activities or lounging at home. Enjoy a snug fit that moves with you, ensuring maximum flexibility and comfort throughout your day. Ideal for both active and casual wear, our lightweight long underwear keeps you cozy while maintaining a sleek profile. Embrace the cold with confidence and style!
$63.97-$85.00
WAS: $85.00*
slim fit light weight merino jersey fabric uses a nylon core to increase durability while still keeping 100% merino wool next to skin fully functional fly merino- lined, 1. 5 ”( 4 cm) wide elastic waistband designed for maximum comfort flatlock seam construction designed to minimize chafing fit...
$9.97
WAS: $24.99*
varitherm base layer lightweight, second skin feel champion vapor technology with x- temp™ moisture wicking quick drying ultra soft brushed back fabric close- to- the- body flexes and stretches for total mobility chafe- resistant stitching no- bind elastic waistband functional fly...
5
soKate120mm
I already own many Duofold items and getting the leggings was a no brainer. I like the excellent quality and the warmth it provides. The fabric is very stretchy without being too constricting. It has a fly for those who use it. The fit is perfect.
5
DeniseLG307
Bought this for my husband who works outside, he said they are comfortable and keep him warm
5
Nita22
Bought them for grandson, perfect fit& durable.. he loves them!!!!
5
YA7E
honestly very skeptical at first, especially considering the price but these are one of the most comfortable pair of pants i own, they definitely regulate temperature
5
rubdog5
A must when going snowboarding. My legs were very warm and comfortable to wear
$14.97
WAS: $44.99*
designed with dri- release® technology, the lightweight varitherm is crafted to transition from warm to cold weather to keep you dry no matter what the season
5
Jordan2121
Fits comfortably and can move well in them. Perfect for any activity.
5
ToastyWarm
The Champion Duofold Men's Varitherm Expedition long johns are the best! A little pricey compared to some others, but you get what you pay for. I love the thickness, double layered. They keep my family warm during Winter sports. These `` Expedition '' pants are enough to wear under your snow pants... no need for another layer of sweatpants, etc. This brand, style is the ONLY one I have purchased since I became aware of them... I believe that's been over two decades! Now, I 'm buying them for my grandchildren!
5
Bengi
Really comfortable and warm better than any others that I ’ ve worn
5
powerstroker57
Bought this for a Spartan race out in the cold rain and kept me warm! Highly recommend! Super comfortable too!
5
Mr B
Great product**
$37.97
WAS: $60.00*
I bought the 2. 0 base layer a few years ago and they 're my go to long underwear for the extreme cold. ... fit fitted baselayer leggings inseam: 30 1/2 ” technology ua base™ 2. 0 active baselayer is lightweight, flexible, and breathable for high activity...
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.
$44.97
WAS: $60.00*
fit fitted baselayer 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 causing microbes to keep you...
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.
$63.97
WAS: $100.00*
I wear these for while working outside, and they do a great job of keeping me warm while I ’ m doing light work. ... I was amazed how warm and comfortable this
5
Fits like a glove, great material, true sizing.
5
SK719
Keep me warm while doing ice rescue training
5
JohnG111
Absolutely amazing- wore on single digit weather and only my hands and feet were cold
5
Dh2207
I bought these for my boyfriend who is an avid hunter and Lineman, he loves them! They keep him warm without getting sweaty!
5
Jm6990
I don ’ t like wearing a coat in Wisconsin. I wanted a solution that provided warmth while still fitting my aesthetic. This base layer 4. 0 has been perfect for me. It ’s fitted, not bulky and makes a huge difference in keeping my chest and arms warm with just a long sleeve on top of it. I recommend!
$72.97-$115.00
WAS: $115.00*
Can wear all day long ... Amazing for skiing, alpine or backcountry ... Very comfortable and warm! ... I NOW OWN 3 PAIR.. THEY ARE AMAZINGLY WARM AND COMFORTABLE! ... Warm and
5
posie
[ Very impressed by Smartwool after hearing from a friend. this baselayer is super lightweight and warm. good for running as it is or layering under a waterproof pair of pants for frigid weather to hike
5
Sdwvt
[ I now own two pairs of these bottoms. I sized up to a medium. I wear them under my snowboard shell pants. I stay warm and they do not bunch. They are versatile. I can wear them around the house and out for walks. I love them.
5
Toasty
[ Driving around all day when it ’s cold out delivering mail and packages to the door, they help keep me warm and moving along. Oh come on, thanks for everything.
5
Lydn
[ The perfect merino base layer and lounging bottoms. Not itchy at all but soft, comfortable and stretchy. I 'm 5' 1, 108 lbs and the S fits well, not skin tight.
5
Prp74
[ I bought this wear at night during a backpacking trip. Worked perfectly when the temperature dipped to 30. More comfortable than the smart wool 150 baselayer.
$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
$63.97-$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.
$72.97-$115.00
WAS: $115.00*
My son loves wearing thermal bottoms for skiing. ... Solid base layer ... Keep me warm in the mornings as I 'm putting gear on, stays cool as I skin up the
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.
$72.97-$115.00
WAS: $115.00*
the technical benefits of 100% merino wool will help you keep your game at a high level for longer. ... slim fit 100% merino wool fabric made with an interlock knit for enhanced comfort, breathability, thermoregulation, and odor resistance fit updated to improve functionality while...
5
Kwhendy
Bought these about a week ago and wear them nearly every day. I love how they keep me warm but do n't make me hot.
5
Mountain time
Fit great especially in length. Perfect weight to stay warm in cold weather.
5
tjflan2
Fit true and worked outstanding as base layer for football game. Very comfortable and breathable.
$74.97
WAS: $100.00*
I love it besides the thumb space. ... Could n't be happier with the warmth. ... I work in a meat room and it ’s very cold, I only have to wear my base 4 shirt and my work tshirt and I ’ m kept
5
Mom2025
Got this for my daughter, she is a teacher. Her room is cold and then she has bus duty periodically. So the 4. 0 is perfect for being somewhat sedentary. Surprisingly, actually keeps her warm! She is a chilly person normally, so cold temps are miserable for her. We 've tried many products. The Under Armour is work the investment!
5
KarenK11
I am always cold. This is the solution! Love it!
5
East Coaster
These are the best long underwear going. I mind the cold but not when wearing these.
5
Jea970
The fit is loose but not so lose that I would exchange for a smaller size. The shirt is warm but not too warm when inside. Outside it keeps me toasty at 30 degrees and I ’ m always complaining of being cold. All in all, I ’ m very happy with this purchase.
5
I recently purchased the Under Armour Base 4. 0 Crew, and it's exceeded expectations. This top delivers comfort, warmth, and performance.
$59.95
regular fit crewneck long sleeve shirt tapered pants 180° stretch for enhanced mobility soft, everyday casual feel with lightweight knit that keeps them
$90.00
slim fit base layer bottom constructed with lightweight merino jersey fabric with a recycled nylon core for increased durability features merrow stretch stitching designed to elevate comfort, range of motion, and fit merino- lined elastic waistband for maximum comfort 31 ”
5
ErinH
[ These worked great for skiing in single digit to mid- 20 ’s temps. They ’ re comfortable, not scratchy, warm but breathable. Will definitely buy more.
5
Wasloki
[ Bought for my wife for an upcoming trip to the Arctic. She loves them. She says they are soft and not itchy. Like they don ’ t require to much special treatment in the wash and don ’ t shrink
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
$90.00
slim fit to contour to you lightweight merino jersey fabric flatlock seam construction fully functional fly merino- lined elastic waistband ... beautiful color; soft so comfortable
$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...
$64.95
fit and design interlock knit crew neck with set- in long sleeves flatlock seam construction designed to eliminate
5
Toasty
[ I bought these for my grandson for skiing and he likes to wear them like a sweater at times. What more do you want, warmth and some style. He loves them.
5
Nana
[ I purchased these for my grand daughters, to provide extra warmth without extra bulk, for our cold Michigan winters. They love sledding, playing in the snow and hiking with their mom, dad and brothers.
5
bethr524
[ I bought this Smartwool baselayer top because I really needed something that would wick the sweat away when I was exercising outdoors on those chilly days. This top does exactly what I want. It's soft and comfortable and keeps my core dry even when I sweat beneath other layers. It washes up easily and does n't retain odors. I 'm very happy with this item.
5
WI_Dad
[ Bought for our 5 year old daughter to use while skiing in UT. She is very picky about colors and general comfort but she loved this smart wool baselayer. So far has held up to washing as well. Will buy another when she outgrows this one.
$24.99
Keeps you warm ... He wears them every day and they keep him warm. ... I love them they are thin not heavy for laying a must buy brand if you want thicker and warmer thermal get the same brand in expedition version military fleeced
5
Lynn2025
I bought these for my son. He wears them every day and they keep him warm.
5
YOYO90
I love them they are thin not heavy for laying a must buy brand if you want thicker and warmer thermal get the same brand in expedition version military fleeced ok.
5
skiellen
Bought these for skiing to go under ski pants and worked well. Less expensive than most but did the trick. They do run large however. Large was huge!!! We ended up with a small for my son.
5
Socker mom1
Great product at a good price. We need to buy the shirt.
5
Tacomama
I bought these for my husband& he is very happy with the purchase
$110.00
This is the most comfortable and effective long underwear I have ever had. ... Love that something fits tall women, is functional, comfortable, and
$110.00
These pants are very flattering with the high waist and are comfortable and warm. ... Great base layer for pairing with ski boots. ... These have a great amount of stretch and cute colors, keep me
5
Jacketquestion
[ I was skeptical after reading reviews but I really like these tights. The waist is high and seamless and very comfortable. Also doesn ’ t dig in creating muffin top stretchy and warm. Looks great under skirts for winter. Totally recommend. Feels lighter than the coordinating tops. True to size.
5
JLKNH
[ Good fit, snug but very moveable, slightly more so than Intraknit 200, although both are awesome. Pair with waterproof( maybe) lightly lined pant for full winter warmth without the bulk. Love the fun pattern to make life more interesting. Highly recommend!
$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,...
$79.00
WAS: $89.00*
the discover family is overmeyer's top selling base layer collection featuring flat seam construction for comfort, a soft brushed interior, and fun one- of- a- kind colors and
5
Ah11
[ These tights were so lightweight but very warm. I 've been wearing them under shell snowpants and have stayed roasty toasty during all day skiing adventures!
$49.97-$60.00
WAS: $60.00*
Perfect outdoor gear, a little long to size, but will probably last for more than one season. ... Very cozy and comfy. ... Perfect for outdoor school, or pjs. ... Comfy and the blue color is
5
Cindy
[ I bought this for my 6 yr old to wear for her first ski trip to wear under her bib. Worked perfectly! Not too thin and not too thick. She did n't even complain about it being itchy.
$64.95
fit and design interlock knit covered elastic waistband adds comfort flatlock seam construction designed to eliminate
5
Cindy
[ I bought this for my 6 yr old to wear for her first ski trip to wear under her bib. Worked perfectly! Not too thin and not too thick. She did n't even complain about it being itchy.
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