Base Layer & Thermal Underwear

Smartwool Kids' Classic Thermal Merino Base Layer Bottom

$65.00

Our Kids' Classic Thermal Merino Base Layer Bottom uses our super soft Mid 250 interlock knit—perfect for layering in cool conditions and great for wearing alone on a mild day. Now your kids can be...

Patagonia Women's Capilene Midweight Bottoms

$89.00

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® P...

50% Off

Terramar Below Zero 1/2 Zip 3.0 Shirt - Women's

$29.99

~~$60.00~~

The Below Zero Half-Zip Top is the perfect piece to keep you warm. The extra durable four way stretch provides support and ease of movement in all directions as you move. The smooth face of the f...

17% Off

Terramar Women's All Season Merino 1.0 Pant

$49.99

~~$60.00~~

Terramar's All Season Merino Pant features merino lofted fabric which is soft against the skin and provides a quick-drying warmth and comfort. Ideal as a lightweight first layer that performs over ...

23% Off

Terramar ThermaSilk CS Pointelle Silk Lightweight Pants - Women's

$45.99

~~$60.00~~

The Miracle of SilkAfter 4000 years, nature and science have joined forces to produce silk long underwear which can help thermo-regulate the body's temperature and dramatically speed up the dispers...

53% Off

Terramar Cloud Nine Scoopneck Print Shirt - Women's

from $21.00

~~$45.00~~

The Cloud Nine Scoop Neck Top is the ideal piece for all day warmth and comfort while being out in the elements. This versatile piece features an ultra-soft, midweight fabric utilizing our featur...

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...

38% Off

Person wearing a black long-sleeve athletic shirt and leggings on a white background

$24.95

~~$39.95~~

This form-fitting, super soft baselayer top 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. Activ...

38% Off

$24.95

~~$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...

27% Off

Three children wearing black wetsuits on a white background

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

$21.99

~~$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...

27% Off

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

$39.99

~~$55.00~~

The Below Zero Crew is the perfect piece to keep you warm. The extra durable four way stretch provides support and ease of movement in all directions as you move. The smooth face of the fabric is g...

38% Off

$29.99

~~$48.00~~

This Terramar Cloud Nine 2.0 Baselayer Turtle Neck is designed to keep you warm and comfortable during outdoor activities. Made with soft, lightweight fabric and featuring a turtle neck, it is perf...

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...

27% Off

$39.99

~~$55.00~~

The Below Zero Performance Tight is the perfect piece to keep you warm. The extra durable four way stretch provides support and ease of movement in all directions. The smooth face of the fabric is ...

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 ...

$179.00

VOORMI does it again with their Women's Expedition 1/4 Zip top! The 1/4 Zip boasts our innovative DUAL SURFACE™ Precision Blended Wool, a fabric that keeps your warm without compromising breathabil...

$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...