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Base Layer Bottoms
Jane Lite Crop Base Layer Leggings - Women's
Wild RyeA lightweight base layer with a shortened silhouette, the women's Wild Rye Jane Lite crop leggings will keep you warm (but not too warm) from spring skiing to summer camping.
Klara High-Waist Base Layer Pant - Women's
Kari TraaLooking for a base layer legging with a sleek, soft design? The women's Kari Traa Klara high-waist base layer pant has a slim silhouette with an extra-high, extra-comfy waist for added coverage.
LIFA Merino Midweight Graphic Base Layer Pants - Women's
Helly HansenCombining a warm, breathable 100% merino wool exterior with a 100% LIFA® wicking interior, the Helly Hansen LIFA Merino Midweight Graphic pants are the perfect base layer for cold-weather pursuits.
Lam Base Layer Pants - Women's
Kari TraaA go-to base layer for winter play, these Kari Traa Lam base layer pants are a supersoft, supersmooth pair of merino wool leggings with ergonomic lines for a pro-sport look.
Lam Base Layer Pants - Women's
Kari TraaNaturally odor-resistant with mesh ventilation to help prevent you from overheating, the women's Kari Traa Lam base layer pants have a supersoft feel for next-to-skin comfort in any season.
Lhotse Base Layer Pants - Men's
Picture Organic ClothingMake your first layer a comfortable one with the men's Picture Organic Clothing Lhotse base layer pants. They feature chafe-free seams and a nonirritating elastic waist band.
Lifa Merino Midweight Base Layer Pants - Men's
Helly HansenFend off the chill and stay out longer in the men's Helly Hansen Lifa Merino Midweight base layer pants. Built for winter fun, they blend merino wool with technical fabric to keep you cozy and warm.
Lightweight Base Layer Bottoms - Men's
REI Co-opThese REI lightweight base layer bottoms are designed to keep you warm and wick away moisture during high-performance outdoor activities when the temperature starts to drop.
Lightweight Base Layer Bottoms - Men's
REI Co-opFrom morning's first frosty steps to midday sweat and exhilaration, the men's REI Co-op lightweight base layer bottoms wick and breathe to keep you comfortable all the way.
Lightweight Base Layer Bottoms - Men's Tall Sizes
REI Co-opThe men's REI Co-op lightweight base layer bottoms wick and breathe to keep you comfortable from the first cold steps of morning to sweaty exhilaration on the trail hours later.
Lightweight Base Layer Tights - Women's
REI Co-opThe women's REI Co-op lightweight base layer tights keep your comfort level high from the first cold steps of morning to the sweaty joy of working your way up a steep trail.
Lightweight Base Layer Tights - Women's Plus Sizes
REI Co-opThe women's plus-size REI Co-op lightweight base layer tights warm you in the morning chill, then wick and breathe to keep you cool as you work your way up a hot afternoon trail.
Lightweight Long Underwear Bottoms - Infants'/Toddlers'
REI Co-opLayer your little one with the REI Co-op lightweight long underwear bottoms for infants and toddlers. Designed for warmth, these bottoms are easy to pull on and absorb moisture as it comes.
Lightweight Long Underwear Bottoms - Kids'
REI Co-opLayer your hiking pal with the REI Co-op lightweight long underwear bottoms for kids. Designed for warmth, these bottoms are easy to pull on and wick moisture for comfort.