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Underwear Bottoms
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.
Logan Base Layer Bottoms - Men's
LoleWhen it comes to base layers, basic is better. The men's Lole Logan base layer bottoms are perfect under your gear for outdoor training or activities, or for everyday life.
Merino 150 Lace Base Layer Bottoms - Women's
SmartwoolLayered under a pair of pants or on their own, these women's Smartwool Merino 150 Lace base layer bottoms are just the thing for an afternoon of snowshoeing or cool-weather hiking.
Merino 185 Base Layer Bottoms - Men's
REI Co-opSoft, breathable and naturally odor resistant, the ultrafine merino wool of the men's REI Co-op Merino 185 base layer bottoms is just as beloved while sweating on the trail as sleeping in the tent.
Merino 185 Base Layer Bottoms - Men's Tall Sizes
REI Co-opSoft, breathable and naturally odor resistant, the ultrafine merino wool of the men's REI Co-op Merino 185 base layer bottoms is beloved for sweating on the trail—and just sleeping!
Merino 185 Base Layer Bottoms - Women's
REI Co-opJust as beloved while sweating on the trail as sleeping in the tent, the ultrafine merino wool of the women's REI Co-op Merino 185 base layer bottoms is soft, breathable and naturally odor resistant.
Merino 185 Base Layer Bottoms - Women's Plus Sizes
REI Co-opJust as beloved while sweating as while sleeping, the ultrafine merino wool of the women's REI Co-op Merino 185 base layer bottoms is soft, breathable and naturally odor resistant.
Merino 260 Tech High Rise Base Layer Leggings - Women's
IcebreakerWarm merino bottoms for the coldest months, the women's Icebreaker Merino 260 Tech High Rise base layer leggings are great for winter layering on skiing, snowshoeing or other cold-weather adventures.
Merino Bikini Underwear - Women's
REI Co-opStay dry on the trail in the soft, breathable and naturally odor-resistant REI Co-op Merino Merino Bikini Underwear for women. They're made to keep you comfy throughout the day.
Merino Boxer Briefs - Men's
REI Co-opStay dry on the trail in the soft, breathable and naturally odor-resistant REI Co-op Merino Boxer Brief Underwear for men. They're made to keep you comfy throughout the day.