Base Layer & Thermal Underwear

Smartwool Women's Intraknit Thermal Merino Base Layer Crew

$130.00

This minimalist-style crew is anything but insignificant. Our Women's Intraknit™ Thermal Merino Base Layer Crew is a lightweight, super-moveable top, made for all of your most extreme cold-weather ...

SmartWool Women's Classic Thermal Merino Base Layer Crew

$115.00

Meet the new and improved Women's Merino 250 Base Layer Crew. We've updated this 100% Merino wool fan-favorite with new color options and an enhanced fit to improve functionality while elevating ae...

50% Off

Man wearing a black long-sleeve shirt on a white background

$19.99

~~$39.95~~

This form-fitting, lightweight top for men will help keep you warm and dry. Its wicking properties take moisture away from your body while the poly blend fibers help keep you warm. Active stretch a...

50% Off

$19.99

~~$39.95~~

This form-fitting, lightweight pant for men will help keep you warm and dry. Its wicking properties take moisture away from your body while the poly blend fibers help keep you warm. Active stretch ...

50% Off

$19.99

~~$39.95~~

This form-fitting, super soft baselayer pant for women will help keep you warm and dry. Its wicking properties take moisture away from your body while the poly blend fibers help keep you warm. Acti...

33% Off

Three children wearing black wetsuits on a white background

Child wearing a black long-sleeve shirt on a white background

$19.99

~~$30.00~~

This form-fitting, lightweight base layer will help keep you warm and dry. Its wicking properties take moisture away from your body while the poly blend fibers help keep you warm. Active stretch an...

Woman wearing a black long-sleeve top and pants on a white background

Person wearing a black long-sleeve athletic top on a white background

$89.00

~~$0.00~~

A classic, all-around polyester baselayer made with 50-100% recycled content. The smooth, soft face makes for easy layering. Hollow-core yarns and a diamond-grid back trap warm air, wick moisture a...

Patagonia Men's Capilene Midweight Bottoms

$79.00

A classic, all-around 100% recycled polyester baselayer. The smooth, soft face makes for easy layering. Hollow-core yarns and a diamond-grid back trap warm air, wick moisture and dry fast. HeiQ® Pu...

53% Off

Woman wearing a black long-sleeve top on a white background

Woman wearing a blue long-sleeve top and pants on a white background

$21.00

~~$45.00~~

Women's 2.0 Cloud Nine Crew Lightweight Top A light base for your winter cardio pursuits Ultra-soft brushed surface traps in heat and is breathable 4-way stretch fabric doesn’t restrict movement A...

Under Armour UA Base™ 2.0 Women's Leggings

$60.00

Meet the all-new UA Base™—delivering the same trusted warmth without the bulk—now softer and smoother than ever for unmatched comfort on every adventure. UA Base™ 2.0 Active Baselayer is lightweig...

$60.00

Meet the all-new UA Base™—delivering the same trusted warmth without the bulk—now softer and smoother than ever for unmatched comfort on every adventure. UA Base™ 2.0 Active Baselayer is lightweig...

25% Off

Person wearing a black long-sleeve top and red beanie on a light gray background

Woman wearing a light purple long-sleeve athletic top on a white background

$52.50

~~$70.00~~

The super soft, half-zip that’s at home in the high alpine and casual days at lower elevations This perfect moisture-wicking base layer is buttery soft, allowing you to move effortlessly through an...

Smartwool Men's Classic All-Season Merino Base Layer Long Sleeve Shirt

$90.00

Spring skiing or summer camping? The year-round Men's Classic All-Season Merino Base Layer Long Sleeve is game for either. With our Core Spun technology, we've wrapped lightweight Merino around a n...

Woman wearing a blue and floral long-sleeve top on a white background

Woman wearing a patterned long-sleeve top and leggings on a white background

$130.00

Meet the Women's Classic Thermal Merino Base Layer Colorblock Crew. This 100% Merino wool fan-favorite combines the moisture management, temperature regulation, and odor resistance of Merino with t...

Woman wearing a black long-sleeve athletic shirt on a white background

Person wearing a black full-body suit on a white background

$90.00

An all-season favorite, the Women's Classic All-Season Merino Base Layer Long Sleeve can be sported as a base layer in the fall or summer when it's time to go backpacking. This base layer features ...

25% Off

Mountain Hardwear Men's Butter Up™ Slim Pant

$74.25

~~$99.00~~

An alpine-inspired active slim pant that can be worn alone or as a base layer From high alpine trails to the climbing gym, the Butter™ Slim Pant is a versatile, buttery soft base layer that pairs p...

25% Off

Mountain Hardwear Men's Butter Up™ Long Sleeve Shirt

$45.00

~~$60.00~~

Crucial UPF 50 sun protection that’s moisture wicking and anti-odor for running solo or layering. Make every high effort outing smooth as butter with a long-sleeve layer that’s worth its weight in ...

$129.00

Now available in our Phase.SC™ concealment patterns, Blowdown and Harvest, the 1/4 Zip Mock Neck is the feather-light companion for folks on the move. Revel in comfort and style with this adaptable...

Smartwool Kids' Classic Thermal Merino Base Layer Crew

$65.00

Our Kids' Classic Thermal Merino Base Layer Crew is made of 100% responsibly sourced Merino wool to help your little ones stay comfortable on snow days and activities in the mountains. With a flatl...

$43.00

~~$0.00~~

Our Men's Active Stretch Bottom offers superior moisture-wicking performance combined with thermal warmth to keep you comfortable during any activity. Its flexible, stretch fabric moves with you, p...

$43.00

~~$0.00~~

Our Men's Active Stretch Crewneck delivers reliable thermal performance with a comfortable, flexible fit. Designed to wick moisture and retain warmth, this top keeps you dry and cozy during intense...

$43.00

~~$0.00~~

The Women's Active Stretch Crewneck is a versatile long-sleeve base layer designed to keep you comfortable and dry during any activity. Its moisture-wicking fabric moves with you, providing a snug ...

$43.00

~~$0.00~~

The Womens Active Stretch Tight combines moisture-wicking technology with thermal warmth to keep you comfortable and dry. Its stretchy, close-fitting fabric moves with your body, providing support ...

25% Off

Coldpruf Polypropylene Underwear Pants - Kid's

$14.99

~~$20.00~~

The Enthusiast underwear program by Coldpruf features single-layer 100% polypropylene construction. It is designed to give a close comfortable fit without being restrictive. The Enthusiast is light...

Coldpruf Quest Performance Youth Crew Shirt

$25.00

The Holy Grail of base layers. Single-layer, jersey knit fabric Fabric Weight: 6.5 oz Fiber Content: 85% ColdPruf® Technical Fiber Polyester with SILVADUR™ Intelligent Freshness / 15% Spandex...

Coldpruf Quest Performance Youth Unisex Pant

$25.00

The Holy Grail of base layers. Single-layer, jersey knit fabric Fabric Weight: 6.5 oz Fiber Content: 85% ColdPruf® Technical Fiber Polyester with SILVADUR™ Intelligent Freshness / 15% Spandex ...

$37.99

Performance that moves with you. Designed for cold to very cold conditions and medium- to high-activity levels, the ColdPruf® Style 89A Performance Crew is a versatile base layer that can also be w...

5% Off

$37.99

~~$40.00~~

Performance that moves with you. Designed for cold to very cold conditions and medium- to high-activity levels, the ColdPruf® Style 89B Performance Pants deliver essential warmth, comfort, and flex...

$37.99

~~$0.00~~

Performance that moves with you. The ColdPruf® Style 49B Performance Pants are designed for cold to very cold weather and medium- to high-activity levels. With a close athletic fit, they sit just b...