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Stay warm and comfortable with our work and sport long underwear collection, designed for ultimate performance in any environment. Crafted from moisture-wicking and breathable fabrics, these essentials provide excellent insulation while keeping you dry during intense activities. The lightweight, stretchy materials ensure a snug fit without restricting movement, making them perfect for layering under work gear or athletic wear. Whether you're on the job or enjoying outdoor sports, our long underwear offers the perfect blend of comfort and functionality to keep you going all day long.
$40.00
They are warm enough to work on cold days in New England and the fabric is high quality. ... Great for biking in the rain ... This is definitely the most comfortable and versatile piece of workout apparel that he
5
emykaboom
Great on its own or under a pair of jeans for extra warmth. Comfortable and light weight for an active boy
5
K8Eo
Are they strictly for cooler temps, as it will warm up here in a month
5
Football Grammie
I buy my grandson his football clothing from here every year. Never disappointed!!!
5
Hockey mom 2021
[ Ordered this one for my son who is playing hockey. This is definitely the most comfortable and This is definitely the most comfortable and versatile piece of workout apparel that he own. My son likes it so much.
5
SwimmrMama
[ My son lives in these leggings with shorts layered over year round. They are warm enough to work on cold days in New England and the fabric is high quality. Wish they were a little longer but otherwise can ’ t be beat!
$54.99
I am 5ft 3in, and weigh 115lbs, and the small works well for me. ... I am truly amazed at how well this bottom works to keep me warm. ... Nice fit and super
5
ChelseaR
Was absolutely impressed with these! So warm, yet light weight and breathe able. Nice fit and super comfortable!!
5
Mamie90
I am impressed with my Carhartt Poly- wool bottom. I received the thermal as part of a Carhartt Crew Field Test, but I will be ordering two more complete sets. I am truly amazed at how well this bottom works to keep me warm. One must understand, I am constantly cold, so to me, this is amazing. I am 5ft 3in, and weigh 115lbs, and the small works well for me. I have laundered it, with no ill effects. It has retained it's shape and fit very well. The bottom also fits perfectly under skinny jeans, without bunching or showing. I live in Iowa, and it gets cold here. While wearing this pair of thermal bottoms, I stayed warm. It really goes long way in cutting the harsh winds we get out here on the prairie. I can honestly recommend this thermal bottom to anyone who gets cold in the winter.
5
JulieB
I received as part of the Carhartt Crew Field Test. It is the perfect weight, feels very comfortable and keeps you warm. It has a bit of a stretch to it so it easy to move around in. Very good quality. You wo n't be disappointed.
5
ErinB
I received this item as part of the Carhartt Crew Field Test. The fabric is softer than I was expecting and the fit is pretty true to size. They are very warm as an under layer!
5
TeriC
[ These are a really cozy and warm bottom layer for Winter. They run warm, so on a cold day, they are perfect. The waistline band can become bunched from wear and washing so you may need to reposition it after a few washings. Otherwise, a fabulous warm bottom layer that has a soft wool fabric.
$90.00
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
5
JD L.
Like most Smartwool products I have purchased, this one is a nice weight, completely soft and comfortable AND attractive. I get compliments on it all the time.
5
Mike B.
Super comfortable first wear while on a 2 day backpacking trip. It made a great base layer and then when temps when up it was nice on its own. And a layer of sun protection with long sleeves! Odor control was evident, but control being the key word-- definitely not absent. I recommend this shirt and look forward to using again on the next hike and for my trip to the Tetons next month( as well as trying as a base layer for snow skiing!).
5
BJ
Perfect base layer for Spring in the mountains. Not too light, not too heavy, just right.
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.
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
$34.99
Thank you. ... Definitely would recommend this Carhartt base layer pant to my friends. ... Great product and great price. ... Happy with my Carhartt waffle base layer, bought the same thing maybe four years ago and loved them, and I still love
$29.99
it feels thin but works ... it does its job wonderfully and definitely works. ... awesome! ... i bought this like a month ago and oh my god i ’ m glad i did because it ’s so
$44.99
They fit great and keep me nice and warm working outside in the wind all day. ... Wore these under snow pants in- 10 weather for ice fishing and they worked
5
Cynthia
[ My husband said he will never wear anything else since buying these he ’s in love with them!
5
JustinK
[ very nice product here. Keeps me warm in 30 degree weather with gusts, and matches the same style top baselayer well. Overall great buy.
5
EricG
Very comfortable and warm without being too bulky underneath a pair of jeans. Highly recommend!
5
LantzW
Easy to put on great fit and feel
5
Rico 51
I bought these a month ago and absolutely pleased with the quality going back to buy two more and they do keep you warm.
$54.99
They keep you dry and warm all day long and they don ’ t bind while under regular clothes. ... I received this set of base layer pants for a Carhartt Crew Filed Test to test its warmth, comfort, and durability in real world working
5
Robert
Bought these to use as an alternative to fleece lined work pants. Much prefer these as it provides more flexibility, yet keeps you warm. They fit well and pair with my canvas work pants. I particularly like the idea that if the weather warms up enough, I can simply take them off, whereas with lined pants, you 're stuck unless you keep an additional pair of pants with you. These launder well too. The seams in them are placed well so there's no `` tugging '' or tightness. To me, they 're a great cold weather investment.
5
RonaldR
[ Really good and very warm comfortable insulated pants.
5
ToddS
Had the chance to trial these on a field test, very warm and durable. nice snug fit, plenty of room to flex and move. No need for extra layers with these, wore with Carhartt lined bibs and was very comfortable all day
5
DanielF
I received this set of base layer pants for a Carhartt Crew Filed Test to test its warmth, comfort, and durability in real world working conditions. This is by far the warmest and most comfortable set of base layer pants I have ever worn. I wore them over the winter in Colorado and Wyoming in cold weather, heavy snow, and strong winds. I was warm and comfortable no matter what Mother Nature threw at me. They wick away moisture and move with me all day. I would recommend this base layer for anyone who works outdoors in the winter.
5
PatrickK
Received these thermal pants for Carhartt field testing. They strike a nice balance between being very warm, lightweight, and comfortable. Wore under double- front jeans or canvas pants in single- digit temperatures with negative wind chills and my legs stayed warm while moving/working. Their light weight is nice for putting in a pack if it gets too warm while hunting or hiking. They are also comfortable to lounge in in warmer temperatures! Pants are true to size and seem durable, however, I have heard thread stretching when I put them on from time to time( I wear size large and am between a 34- 36 waist).
$60.00
Fit good and can be used similar to winter long underwear ... Under Armor Cold gear is the only under athletic wear I trust for day to day activities and working
5
msales1
These are a nice base layer to use on a cold day run! Depending on the temperature outside and the intensity of your run, you may need another layer over these to keep warn, but on a milder cold day these will work great on their own! Compression and fit worked well for me!
5
jasonic
the coldgear is a great product if one prefers a stronger tighter legging than the average leggings i have all the different leggings UA offers but prefer these th most.
5
Crystal Mo
Got these for my boyfriend, he works outside and these are great for him!
5
tammydee
My husband loves the Cold Gear Under Armour. It keeps him warm all day working on the river. Fits good too.
5
Smerdikov
This product keeps me toasty while working out in the Northeast.
$22.97-$44.99
WAS: $44.99*
I wore them under my Jean's and tshirt to work and they kept me just the perfect warmth. ... It fit really well and was long enough despite my 5' 11 ''
5
JenniferM
I received this thermal shirt as part of the carhartt crew field test and let me just say they are amazing. The fabric is soft and silky and they fit true to size. I wore them under my Jean's and tshirt to work and they kept me just the perfect warmth. I wear them about 3 times a week and wash them as well and they seem to be holding up great so thank you for a great product. Definitely recommend to anyone looking for warmth and comfort
5
Babyd
I received this thermal shirt to test from carheartt crew and I absolutely love it! It is very comfortable and fits perfectly. I love the moisturizer wicking fabric! It has hidden thumb loops to make it easy to put on your jacket. I would definitely recommend this thermal to family and friends.
5
AndreaJ
I received the Base Force Midweight Tech Crew Thermals as part of a Carhartt Crew field test and I'am so happy I did because I love these thermals! My favorite part is the thumb loopholes that keeps your thermal shirt in place when you layer over top of it with jackets or sweatshirts. The thermal is very comfortable and kept me dry at all times. It has sweat wicking& prevents odor. You can not go wrong with this thermal and I highly recommend it.
5
MELANIEW
I couldn ’ t be happier about being chosen to field test this set! As requested I wore these as much as possible( 3- 4 x a week)! These are honestly the best thermals I ’ ve ever worn!! Whom ever designed these thought of everything!! From the warm ultra soft moisture wicking fabric that keeps you dry and toasty, to the stay in place thumb holes in the top for comfort, you couldn ’ t ask for better thermals!!
5
MehganM
Love the deep purple, top base layer! It fit really well and was long enough despite my 5' 11 '' height. If you are a C cup or bigger, you might want to size up, but for anything smaller it should work. It's odd that this was long enough but the matching pants are not as I 'm very proportional. In any event, I 'm grateful to have this top and I love the feminine color! Thank you!
$115.00
Fit true and worked outstanding as base layer for football game. ... Perfect weight to stay warm in cold weather. ... I love how they keep me warm but do n't make me
5
tjflan2
Fit true and worked outstanding as base layer for football game. Very comfortable and breathable.
5
Mountain time
Fit great especially in length. Perfect weight to stay warm in cold weather.
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
srgmnh
These really are a step above. Great fabric, great warmth, hold their shape well. Worth every penny.
4
Jdub
Smart wool has always made quality products and these are no different. But… awfully pricey for a pair of long Johns!
$19.99
Had a pair for years that fit well, was comfortable to wear, could work outside in them. ... They are good quality, last longer than most, they are more comfortable and they do look
5
Tim From Pittsburgh
Quality is hard to find, Champion truly makes a quality product. I asked the Average consumer to try and rival this product, be a champion.
5
Ulyn
Bought 2, Husband very happy. Great price and very good fabric.
5
nonedear
I bought these for my husband. He 'd been wearing flannel pajamas under his pants, but these were so comfortable and so warm that he asked me to get more.
5
Sportspack
The Duofold® Originals Men's Thermal Pants are great! I will be ordering more soon!
5
Peregrin
Though I live in a warm climate and do n't need thermals much, they are great when they are needed. Had a pair for years that fit well, was comfortable to wear, could work outside in them. They wore out so I got another pair. They fit well and I expect good things from then.
$44.99
The tall size fits very well and help keep the chill off when I ’ m working in the cold ... They 're warm, comfortable, and definitely work for my vet calls. ... I ’ ve used it for skiing and also just lounging around the
5
HH
[ Great thermal. Very heavy very warm. Pleasantly surprised it did not shrink when I washed it.
5
CurtisK
I ’ ve used it for skiing and also just lounging around the house. It ’s extremely comfortable and quickly becoming one of my favorite shirts.
5
MicahB
This is great base layer! As far as the appearance parameter goes, I suppose that is limited by the user. But the shirt itself is great.
5
AlanL
I work outside at our airport, mostly outside for hours at a time, sometimes in and out in and out. This piece surprised me. It ’s warm, breathes and I don ’ t get sweaty going from cold to warm. I ’ m 5 ’ 7 165 43 chest 33 waist. I went large and got a perfect fit. I ’ m usually between medium and large in Carhartt so, I have to gamble on everything I buy. This is a winner for me.
5
LucasH
These are great! The tall size fits very well and help keep the chill off when I ’ m working in the cold
$45.00
Kept my son warm in 7 degree weather on our ski trip! ... Very comfortable and warm. ... Warmth for under baseball pants ... I bought these for my son to wear when snowmobiling and he loves the comfortable
5
vbalandra
excellent product. Cheaper than Nike but just as good quality wise
5
Ajlavy23
Husband used them to stand outside in the cold and they helped keep him warm. Fit well and did the job.
5
Scottdownintexas
Very comfortable and warm. Get compression fit.!.!
5
KCKasey
I bought these for my son to wear when snowmobiling and he loves the comfortable fit. He said they are also very warm and fit nicely when layering.
5
Mando298
I bought this for soccer and its very warm so 10/10!
$65.00-$130.00
WAS: $130.00*
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. ... They ’ re tight but flexible and
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!
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
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.
$49.99
The tall size is a definite plus as it keeps you covered while you work in any position. ... Keep up the good work! ... Works great ... Great for working out in the cold even in the
5
KKinzler
My husband loves these!! He practically lives in them. When working on the farm you find yourself running in and out of equipment during those cold months. Just a heads up they will shrink if put in dryer!
5
PedroC
[ Does the job! Stitching on item is top shelf. Keeps you warm. What more could I say?
5
AntonS
Super warm and perfect fit. Would definitely buy again.
5
MildredM
[ My grandson loves the feel the fit the comfort of these thermals he also loves the thumb ring at the end of the shirt sleeve he said it's easy to keep it down while he's putting on other layers.
5
JohnnyK
[ Bought them for hunting tried them out over the weekend. The morning temps were about 4* between the base layer and my jacket I was comfortable.
$39.99
I love how the back is longer and doesn ’ t ride up. ... 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...
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.
$115.00
[ I got these as a gift for someone and was impressed by how soft they were. ... Perfect for the cold winter months! ... Exactly what you expect from smart wool base
5
Connie
[ My old lady and I have the smart wool top and bottom 250 base layer set. They are exactly what you expect from smart wool. Great quality, the warmth I needed, and pretty useful in most conditions. If you need a base layer or something lightweight to wear on a chilly/cold night- These are useful and for great value.
5
Britt802
[ At first these pants feel sort of itchy but once you 're moving around in them it's very comfortable. I first wore them in 35- 40F under normal hiking pants and was too warm while moving. They do regulate body temp well but I wo n't be wearing these hiking unless it's below 35F. I 'm also not a cold bodied person and I move fast.
5
jjrunning
[ We live in Minnesota, and have pretty cold winters. This baselayer has kept me much warmer than my old baselayers, so far! Great for running, walking or casual use. I plan on using them for a winter camping trip coming up as well.
5
KonaSunsets
[ Bought these as a gift. My daughter said her husband LOVES them. He's had a pair for over 10 years and they are worn out. So a new pair was needed.
5
jackie27
[ I got these as a gift for someone and was impressed by how soft they were. I haven ’ t worn them, but he ’s said they ’ re very warm and not itchy at all. I ’ ll definitely be buying a pair for myself soon!
$115.00
I got These for skiing and they were pretty warm and comfortable. ... It ’s a great base layer that I can depend on. ... They are warm for sure but I can ’ t wait
5
Maw maw Z
My legs will not be cold this winter. They are of good quality and very soft and warm.
5
Sydroo
Fits true to size. Keeps you warm! Relaxed fit and love the color. Makes snowboarding more enjoyable.
5
Mim1
Used these under sweats in below freezing temperatures in Quebec City sometimes needed snow pants too, other times just the two layers.
5
DreambornAnthology
Love Smartwool for days in the snow. It ’s a great base layer that I can depend on. It is super soft when you first buy it but does get scratchier with wash and wear, even with gentle cycles, mild detergent, and hang drying. I tend to wear a thin, cotton free layer underneath for better comfort and more layers. While it does offer some stretch, it is very true to size, so if you are teetering between sizes, size up. You ’ ll be more comfortable and won ’ t risk circulation compression, which will ultimately make you more cold.
5
Kpave
[ These fit so great! I ’ m plus sized and sometimes sizing can be wonky or vague but these are a dream. They are warm for sure but I can ’ t wait until The temperature dips to really put tgem to the test.
$115.00
They also don ’ t look like you ’ re wearing long underwear, so you don ’ t have to wear a layer over them if you don ’ t want to.. aka go to the store for chicken feed and don ’ t want to freeze:) This particular style is more
5
cathy
[ I bought these and the matching top for a hiking trip and LOVE them. They are so soft and comfortable and kept me warm without making me sweat. Perfect!
5
Karen
[ Amazingly soft and NOT itchy at all! High quality and fits very comfortably. Can ’ t wait to try it out soon with cold Michigan winter up north!!
5
Lynn
[ Love the quality and softness of these wool undergarments! I got medium top and bottom and they are true to size. I hike alot in the winter in the Smoky Mountains. These garments kept me cozy and warm! Love the mint green color also!!!
5
inaudwetrusr
[ These are great and probably my favorite pair of base layer bottoms. They are cozy, not too tight and breathe nicely. I ’ d like to buy another pair but my size is out of stock.
5
Ralph
[ I am an avid walker and must have my daily jaunt or I will go bonkers. I have hiked in all weather from the cold sub temps of Minnesota to the rainy and windy winters of Texas. Having warm thermals are essential. Searching online reviews, Smartwool keeps popping up. My wife and I bought two sets each of tops and bottoms and she just simply loved them instantly When ever the temp dips she gleefully pulls on her Smartwool NTS and a shell and she is out the doors. The material is just the right thickness and the seams are well hidden. It instant warms the body and as claimed, do not smell after a few uses As for durability we have to wait and see. We have other woolen garments and we can see these products appear to be durable. No regrets buying them but regrettably the color choices are limited due to stocks available.
$130.00
My favorite underlayer by a long shot, I literally wore it every day of my last ski trip- 5 days in a row. ... The color is very pretty and overall was a very comfortable base
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.
$140.00
I typically get a size small for base layers, but love the medium for leggings to wear with oversized sweatshirts and sweaters. ... Super comfy, warm, durable( they still look like new after many washings), and the patterns add a fun
5
Andi
[ These are my everyday leggings for the winter season. Super comfy, warm, durable( they still look like new after many washings), and the patterns add a fun styling. I typically get a size small for base layers, but love the medium for leggings to wear with oversized sweatshirts and sweaters.
$39.99-$41.99
These leggings worked great as `` long underwear '' when I need to be out in the cold. ... I bought these to wear under my jeans to an Eagles game and I was soooo
5
Figarohall
I bought these to wear under my jeans to an Eagles game and I was soooo warm.
5
Lynnann816
These leggings worked great as `` long underwear '' when I need to be out in the cold.
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