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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!
$65.00-$130.00
WAS: $130.00*
Love it, it is light but warm I wear them all winter long ... Super lightweight base layer that keeps me warm while snow camping and treking. ... Love this base layer pant to compliment the
5
abeck
[ I received these as a Christmas gift. I love them under my bibs for snowboarding! They ’ re tight but flexible and comfortable. They keep me warm on the mountain.
5
shellydk
[ I could go on and on about this whole line from Smartwool. It's their best thing in a very long time and I 've been a fan for years. The material is very soft, has a great but comfortable fit. These bottoms also have a nice wide and sturdy waste band so there is no bunching or other uncomfortable nonsense in that area. These are very warm, so perfect under a shell pant or bib for alpine skiing, but I do n't think I would wear them on a tour.
5
Hmae
[ Love the style. These are very warm and keep me toasty on those cold days. Would recommend to anyone looking for a quality under layers... very cute!
$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.
$115.00
designed for- 30° f- 60° f temperature range machine wash cold inside out with like colors do not bleach or use fabric softeners lay flat to dry do not
$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.
$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
$28.48
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.
$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
$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
$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.
$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.
$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...
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