Some wear it as a smoothing base for daily wear. Some wear it as a light and warm base layer under their gear. Either way, the women's REI Co-op Silk camisole makes a great foundation.

Underwear TopsCamisoles

The REI Silk long underwear bottoms are smooth, soft and incredibly comfortable. They'll help keep you warm on a cold day and they work great under additional layers.

Underwear BottomsBase Layer Bottoms

The REI Silk long underwear bottoms for women are smooth, soft and incredibly comfortable. They'll help keep you warm on a cold day and they work great under additional layers.

Underwear BottomsBase Layer Bottoms

Lightweight and supple, the REI Silk crew shirt provides great warmth for its weight and offers luxurious comfort.

Underwear TopsBase Layer Tops

Lightweight and supple, the REI Co-op Silk long-sleeve crew shirt provides great warmth for its weight and offers luxurious comfort.

Underwear TopsBase Layer Tops

Some wear it as a light and warm base layer under their gear. Some wear it as a smoothing base for daily wear. Either way, the women's REI Co-op Silk V-neck shirt is a great foundation.

Underwear TopsBase Layer Tops

Soft, cozy and naturally moisture-wicking, the Icebreaker Siren bikini underwear offer itch-free merino wool fabric in a modern, sleek fit.

Underwear BottomsBriefs - DEPRECATED

Made with a soft, durable merino blend to regulate body temperatures in all weather conditions, the Icebreaker Siren bra is lightly supportive and endlessly comfortable for easy everyday layering.

UnderwearSports Bras

Super comfortable and naturally odor-resistant underwear bottoms for everyday wear, the Icebreaker Siren Hipkini briefs rightly deserve a place in your top drawer.

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Cozy, breathable and soft, the Icebreaker Siren thong underwear offer moisture-wicking, itch-free merino wool fabric in a modern fit.

Underwear BottomsThongs - DEPRECATED

A seamless bra crafted in a breathable, organically grown cotton blend? Yep. The prAna Sopra Seamless bra's soft yet supportive fabric frees you from the discomfort of digging seams.

UnderwearSports Bras

Breathable, supportive and cool, the Arc'teryx Soria Long Line bra is designed to deliver the all-day, next-to-skin comfort that you want for a long outing on the trails.

UnderwearSports Bras

Ideal for both gentle sun salutations or heart-pumping resistance workouts, the Beyond Yoga Spacedye Lift Your Spirits bra provides generous stretch and full recovery wear after wear.

UnderwearSports Bras

These lightweight, itch-free merino wool boy shorts are perfect for daily wear or kicking back after a long day outside. The Icebreaker Sprite Hot Pants also have offset seams for all-day comfort.

UnderwearUnderwear Bottoms