Underwear

Wonderfully-patterned and even more comfortable, Smartwool's Men's Intraknit Thermal Merino Base Layer Pattern Crew uses our latest and greatest technology to help keep you warm as you wander and get active. This Smartwool base layer is 3D-mapped for a near-custom fit and freedom of movement, while ribbed elbows provide extra flex room. New technology allows us to seamlessly knit mesh ventilation in gender-specific zones designed to help keep your body dry and warm as you venture out in comfort.

This minimalist-style crew is anything but insignificant. It is a lightweight, super-moveable top, perfect for all of your sweatiest cold-weather activities. With Merino Sport yarns and gender-specific ventilation perfectly placed to maximize thermoregulation and breathability in high-intensity activities, it helps amplify moisture management, movement, and comfort.

Smartwool has updated the fit of our Men's Merino 250 Base Layer 1/4 Zip to improve functionality while also enhancing aesthetics. As one of their heaviest base layer tops and best base layers for cold weather, this garment uses 100% responsibly sourced Merino wool, shoulder panels, and a flatlock seam construction to help minimize chafing as well as help keep you comfortable and temperature-regulated as you enjoy high-intensity skiing, hiking, running, and more.

Meet the better-than-ever Men's Merino 250 Base Layer Crew. Smartwool has updated this 100% Merino wool fan favorite with new colors and a new fit to improve functionality while enhancing aesthetics. Shoulder panels eliminate top shoulder seams, and a flatlock seam construction helps prevent chafing. Add one of their best base layers for cold weather to your winter wardrobe and experience the difference the next time you go skiing, hiking, climbing, or biking.

Guys who want to beat the heat. Hot Shot is equipped with our DropTemp™ technology, boosting your body’s natural cooling capacity. Whether it’s day hikes through Death Valley or sultry summer nights, Hot Shot will keep you cool. Men's Relaxed Fit: form-fitting through the butt and thighs, with extra ease at the leg opening. Features a fly for quick and easy access.

/ MADE FOR Elevating your everyday. Slightly looser than our Slim Fit styles, Ultra combines super-softness with maximum breathability. / BUILT IN TECH BallPark Pouch™, Three-D Fit™, Flat Out Seams™ / HOW IT FITS Relaxed Fit: form-fitting through the butt and thighs, with extra ease at the leg opening. Features a fly for quick and easy access. Men's Trim Fit

The guy who wants to give his balls a boost. This best-selling style is cut from a breathable fabric that’s so soft you won’t want to take it off. Men's Relaxed Fit

The lightest base layer top that’s perfect for active adventure and everyday training, the 150 Zone Long Sleeve Crewe features 150gm jersey corespun with LYCRA® to maximize flexibility.

Versatile year-round base layer bottoms made with 100% merino wool and a slim fit, the 175 Everyday Leggings offer premium breathability, odor-resistance and next-to-skin comfort. Perfect layering for Autumn to Spring, hitting the slopes or just in need of some added warmth from an extra layer during the work week.

A classic, all-purpose base layer T-shirt made with soft and breathable 100% merino wool fabric, the 175 Everyday Short Sleeve Crewe is as versatile as it is comfortable.

Their best-selling base layer bottoms made from soft and breathable 100% merino wool jersey, the 200 Oasis Legless feature a short leg for use with boots. With the soft merino fibers, they will help regulate the body's temperature, no matter weather conditions while also resisting odors.

A versatile 100% merino wool base layer top with a classic zip-neck design, the 200 Oasis Long Sleeve Half Zip combines casual comfort with technical performance.

A versatile 100% merino wool base layer top with a classic zip-neck design, the 200 Oasis Long Sleeve Half Zip combines casual comfort with technical performance.

A versatile, go-anywhere shirt made from breathable 100% merino wool jersey, the 200 Oasis Short Sleeve Crewe is our best-selling base layer top. Fibers that regulates the body temperature in all weather conditions, along with resisting odors; gusseted underarms for mobility and comfort

Icebreaker's best-selling active baselayer bottoms made with their ultra-comfortable 100% merino jersey fabric and an updated design for improved comfort, the 200 Oasis Leggings w/ Fly are the perfect foundation for your everyday cold-weather layering system. The Oasis fabric is not only insulating and highly breathable, but it resists odors during extended use. The slim fit and gusseted construction provide unrestricted freedom of movement, while the brushed elastic waistband and flatlock seams throughout eliminate chafing when you’re on the move.

Icebreaker's best-selling active baselayer bottoms made with their ultra-comfortable 100% merino jersey fabric and an updated design for improved comfort, the 200 Oasis Leggings w/ Fly are the perfect foundation for your everyday cold-weather layering system. The Oasis fabric is not only insulating and highly breathable, but it resists odors during extended use. The slim fit and gusseted construction provide unrestricted freedom of movement, while the brushed elastic waistband and flatlock seams throughout eliminate chafing when you’re on the move.

The benchmark against which all others are judged, very versatile, go-anywhere shirt made from breathable 100% merino wool jersey, the 200 Oasis Long Sleeve Crewe is the best-selling base layer top. Hand-drawn and sketched by artist Damon Watters.

Featuring their most versatile merino jersey fabric, the 200 Sonebula Leggings provide ample warmth whatever the activity. The incredibly soft merino fibers provide assistance in regulating your body temperature in all weather conditions and also is odor resistant.

Icebreaker's lightest base layer top that’s perfect for active adventure and everyday training, the 200 Zone Long Sleeve Crewe features 200gm jersey corespun with LYCRA® to maximize flexibility.

Their technical, cold-weather base layer top for highly aerobic days, the 200 Zone Long Sleeve Half Zip features zoned ventilation panels for active temperature regulation and ample breathability.

Their technical, cold-weather base layer top for highly aerobic days, the 200 Zone Long Sleeve Half Zip features zoned ventilation panels for active temperature regulation and ample breathability.

A warmer midweight version of Icebreaker's best-selling Oasis Leggings, perfect for frigid days on the trails or the mountain, the updated 260 Tech Leggings w/ Fly feature a 100% merino wool fabric for premium softness, insulation and breathability. These odor-resistant baselayer bottoms also feature a gusseted construction for ample range of motion, and the brushed elastic waistband and flatlock stitching throughout eliminate chafing when you’re on the move.

A warmer, midweight version of the best-selling Oasis, the 260 Tech Long Sleeve Crewe is a go-to piece for winter layering, made with 100% merino wool.

A warmer, midweight version of the best-selling Oasis, the 260 Tech Long Sleeve Crewe is a go-to piece for winter layering, made with 100% merino wool.

Technical, cold-weather base layer bottoms for highly aerobic days, the 260 Zone Leggings feature zoned ventilation panels for active temperature regulation and ample breathability.

A technical, cold-weather base layer top for highly aerobic days, the 260 Zone Long Sleeve Crewe features zoned ventilation panels for active temperature regulation and ample breathability.

Built with a super-soft, stretchy and highly durable merino wool blend, and outfitted with the support and comfort you need for both daily life and weekend adventures, the Anatomica Briefs are the underwear you’ve been searching for. With an exclusive Icebreaker supportive fit that makes them even more comfortable, the Anatomica Briefs feature corespun fabric, merino wool fibers wrapped around a nylon core, for increased durability, strength, and next-to-skin softness. Flatlock seams eliminate chafing when you’re on the move, and the contoured pouch offers additional support.

Classic boxer briefs made with a stretchy slim fit and their corespun fabric, the Anatomica Boxers are supportive and comfortable for daily life and active pursuits.

Classic boxer briefs made with a stretchy slim fit and their corespun fabric, the Anatomica Boxers are supportive and comfortable for daily life and active pursuits.

A premium, slim-fit base layer made with luxuriously soft 15.5 micron merino wool fibers and a high-neck design for added protection, the MerinoFine™ Long Sleeve Roll Neck is at the intersection of comfort and performance.