Soft, warm and lightweight, the men's Patagonia Capilene Air base layer bottoms insulate even when wet, dry quickly and resists odors for days of use whether you're on the trail or the slopes.

Underwear BottomsBase Layer Bottoms

Layer smart for chilly adventures. Whether you're trekking through the forest or bombing down the slopes, the breathable, warm men's Patagonia Capilene midweight bottoms are an ideal base layer.

Underwear BottomsBase Layer Bottoms

Built to keep you warm and dry in seriously cold weather, the men's Patagonia Capilene Thermal Weight base layer bottoms have an open-grid pattern for warmth, breathability and moisture wicking.

Underwear BottomsBase Layer Bottoms

These base-layer bottoms keep you warm and dry in seriously cold weather during technical alpine routes.

Underwear BottomsBase Layer Bottoms

Whether you're skiing or heading out on a chilly hike, the men's Smartwool Classic All-Season Merino 3/4-Length base layer bottoms are ideal for year-round layering and comfy enough to wear all day.

Underwear BottomsBase Layer Bottoms

Built for 4 seasons, the men's Smartwool Classic All-Season Merino Base Layer bottoms keep you comfy on snowy days or summer nights under the stars with durable wool-blend fabric and an updated fit.

Underwear BottomsBase Layer Bottoms

Whether you're skiing, hiking or running, Smartwool Classic Thermal Merino 3/4 base layer bottoms provide reliable comfort and breathability with an updated fit to minimize sag and keep you going.

Underwear BottomsBase Layer Bottoms

Updated with a better fit and reliable, resilient merino wool, the men's Smartwool Classic Thermal Merino base layer bottoms keep you comfortably warm through winter and all year long.

Underwear BottomsBase Layer Bottoms

Made for all types of winter activities, this Craft Core Dry base-layer set has flatlock seams that enhance your comfort while the brushed jersey interior offers optimal warmth.

UnderwearBase Layer Sets

Offering superior temperature regulation without the bulk, tasc Performance Elevation Merino men's base layer bottoms deliver light warmth and moisture management for cool-weather outdoor activity.

Underwear BottomsBase Layer Bottoms

An ideal base layer for getting vert or counting off switchbacks, these men's Artilect Flatiron 185 leggings provide soft, breathable warmth while you explore outdoors.

Underwear BottomsBase Layer Bottoms

Harnessing the warming power of Heatwave™ technology, the men's Seirus Heatwave Lite Reversible base layer bottoms reflect heat back to your body, and are now available in a lighter-weight design.

Underwear BottomsBase Layer Bottoms

Harnessing the amazing warming power of exclusive Heatwave™ technology, the men's Seirus Heatwave Reversible base layer bottoms reflect heat back to your body to keep you warm on cold-weather outings.

Underwear BottomsBase Layer Bottoms

Designed to layer under pants or shorts, the men's Smartwool Intraknit Active base layer bottoms help with temperature regulation and moisture management to keep you comfortable while you're active.

Underwear BottomsBase Layer Bottoms