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Stay warm and comfortable with our collection of lightweight long underwear, designed for optimal layering in any season. Crafted from breathable, moisture-wicking materials, these essentials provide a snug fit without adding bulk. Perfect for outdoor adventures or cozy days indoors, our lightweight long underwear offers flexibility and warmth. Choose from a variety of styles that ensure you stay active while maintaining comfort. Elevate your cold-weather wardrobe with these versatile pieces that keep you feeling great, no matter the temperature.
$100.00
My all season classic base layer is lightweight to fit under my jeans providing me with comfortable warmth on cold/cool damp days. ... They ’ re comfortable, not scratchy, warm but
5
Jean G.
My new go- to warmth! My all season classic base layer is lightweight to fit under my jeans providing me with comfortable warmth on cold/cool damp days. I have a seasonal job in an unheated building by a lake. Because they breathe, I can wear these all day to stay warm and dry.
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
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.
4
runnergal832
Bought this a month ago for cold running weather. Wish it wasn ’ t see through but it does the job
4
Mnshopper1234
[ This is super soft and comfortable. I wear it under winter pants for long hikes, snow shoeing or cross country skiing. Keeps me warm.
$100.00
Nice feel and quick to dry. ... Great base layer for cooler shoulder season hikes/paddles and more active winter ski tours when you don ’ t want to sweat through the heavier weight
5
Gimpy
[ This is my first pair of Smartwool base layers, and I love them! Perfect for snowboarding, and will be great as a camp layer in the fall when I 'm backpacking! 10/10 recommend!
5
Ian
Great base layer for cooler shoulder season hikes/paddles and more active winter ski tours when you don ’ t want to sweat through the heavier weight layer. Nice feel and quick to dry.
$85.00
He loved it. ... Great quality, ordered for my husband for
5
MAJB
Great quality, ordered for my husband for Christmas. He loved it... would order again.
$110.00
The waist is high and seamless and very comfortable. ... Looks great under skirts for winter. ... [ Good fit, snug but very moveable, slightly more so than Intraknit 200, although both are
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!
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.
$115.00
Fits comfortably and looks great! ... The merino wool provides that sweat wicking warmth that is so necessary for a base layer in skiing. ... They 're so comfy and warm and stay
5
Julia
Beutiful set. Soft, breathable. Love the color. It doesn ’ t compress your body or stomach
5
Trixie
Very comfortable, warm and lightweight. I would recommend!
5
Mandy C.
Fits comfortably and looks great! Really glad I found this brand.
5
Kate
My new favorite base layers! They fit like a glove and keep me so warm in even the coldest conditions. Obsessed with the Alpine color, so cute!
5
Sam
My absolute favourite base layers. Wish I could live in these legging.
$115.00
It is also super comfortable to ski in! ... [ I really like how soft the shirt is! ... Just your sleek black winter staple top that is also functional! ... I ’ m completely hooked and will never buy any other brand of base layers from now
5
Trixie
This was so comfortable, lightweight and very warm. I would definitely recommend!
5
Fabulous secure fit in a light weight feel good fabric.
5
Kate
The absolute BEST base layers! I ’ m completely hooked and will never buy any other brand of base layers from now on. They ’ re buttery soft and keep me warm( and stylish) on the slopes! 🩷
5
Jessica
This top is so cozy! The turtle line neck is perfect and keep you warm on the mountain.
5
SPow
This is my second Clare top. It's been amazing so far! I 've worn it on some tough hikes and was so impressed that it stayed warm and dry. So comfortable and also cute enough to wear around after. Halfdays team, I wish it had thumb holes. Then it would be perfect.
$125.00
Perfect weight to stay warm in cold weather. ... I love how they keep me warm but do n't make me hot. ... He said the fit was true to size and they kept him warm while snowmobiling and
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!
$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
Tacomama
I bought these for my husband& he is very happy with the purchase
5
DCKP
Great product at a good price. We need to buy the shirt.
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
Johnox
Keeps me warm don ’ t need a lot of clothing on when hunting with its thin material
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.
Lightweight long underwear provides excellent insulation while remaining breathable, making it ideal for layering in various weather conditions. They help regulate body temperature, keeping you warm without overheating during physical activities. Additionally, their moisture-wicking properties ensure you stay dry, enhancing overall comfort.
Lightweight long underwear is typically made from synthetic fabrics like polyester or natural fibers such as merino wool. These materials are chosen for their moisture-wicking capabilities, softness, and ability to provide warmth without bulk. The blend of materials can also enhance durability and stretch, allowing for a comfortable fit.
Lightweight long underwear is versatile and can be worn in various situations, including outdoor activities like hiking, skiing, or running in cooler temperatures. They are also suitable for everyday wear during colder months, providing an extra layer of warmth without adding significant bulk. Their lightweight nature makes them easy to layer under other clothing.
To choose the right size for lightweight long underwear, it's important to refer to the sizing chart provided by the manufacturer. Consider your body measurements, including waist and hip size, and look for a snug fit that allows for movement without being restrictive. Trying on different styles can also help you find the best fit for your body type.
When selecting lightweight long underwear, look for features such as moisture-wicking technology, breathability, and flatlock seams to prevent chafing. Additionally, consider options with added stretch for better mobility and those with temperature-regulating properties for enhanced comfort during various activities. Some may also offer odor resistance for prolonged wear.
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