Stay halfway to shred-ready by sleeping in the women's NRS Lightweight Union Suit. With midweight insulation and a dropseat for ease, this union suit is key to shoulder season adventures.

UnderwearUnion Suits

Great for yoga and training, the Vuori Longline Elevation bra features a dropped neckline, strap details and a wide, comfortable band.

UnderwearSports Bras

Providing lightweight warmth and natural temperature regulation, the Kari Traa Lucie Long-Sleeve base layer top is made from fine merino wool and designed to layer smoothly under your jacket.

Underwear TopsBase Layer Tops

For support on hikes, rides and beyond, choose the Wild Rye Lucille sports bra. It provides reliable, distraction-free support, thanks to carefully placed seams that sit comfortably under a pack.

UnderwearSports Bras

Add a touch of sparkle to your workout with this supportive and comfy prAna Luminance bralette. It's made with stretchy ribbed fabric and a sparkle stripe elastic trim.

UnderwearSports Bras

The Threads 4 Thought Lunette bra is built with crop styling and a racerback to offer just-right coverage that supplies medium support during workouts, and pairs well with high-waisted leggings.

UnderwearSports Bras

Layered 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.

Underwear BottomsBase Layer Bottoms

Whether you wear it on its own or as a base layer, the women's Smartwool Merino 150 Lace V-Neck short-sleeve top is designed for comfort when you're on the move.

Underwear TopsBase Layer Tops

Just 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.

Underwear BottomsBase Layer Bottoms

Just 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.

Underwear BottomsBase Layer Bottoms

Soft, breathable and naturally odor resistant, the women's REI Co-op Merino 185 short-sleeve base layer top is an ideal next-to-skin layer for hiking, cycling and even sleeping.

Underwear TopsBase Layer Tops

The women's REI Co-op Merino 185 short-sleeve base layer top is an ideal next-to-skin layer for hiking, cycling and even sleeping, thanks to the soft, breathable, naturally odor-resistant merino wool.

Underwear TopsBase Layer Tops

Beloved while sweating on the trail—and sleeping in the tent—the ultrafine merino wool of the women's REI Co-op Merino 185 long-sleeve base layer top is soft, breathable and naturally odor resistant.

Underwear TopsBase Layer Tops

Beloved while hiking, biking and even just sleeping, the ultrafine merino wool of the women's REI Co-op Merino 185 long-sleeve base layer top is soft, breathable and naturally odor resistant.

Underwear TopsBase Layer Tops