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Comfort starts with your base layer. Made for wicking and warmth on low-output days, the women's Arc'teryx Rho Lightweight zip-neck base layer top feels supersoft, moves with you and layers easily.

Skiing, backpacking or climbing, the Arc'teryx Rho Wool Long-Sleeve Crew women's base layer top is extremely versatile. It's fitted for easy layering, while stretch and articulation free up movement.

Knit with a Nordic-inspired floral design, the women's Kari Traa Rose half-zip base layer top is made from insulating merino wool for next-to-skin comfort, natural odor-resistance and breathability.

Made from lightweight fleece that's brushed on both sides, the kids' Odlo Royale half-zip mid layer has a high collar with half-length zipper so they can either seal warmth in or vent it as needed.

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

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

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.

With low-profile seams to minimize bulk and maximize comfort, the women's Summit Pro 120 Crew base layer top is an adventure-ready, lightweight base layer made for cold-weather exploration.

Designed with a technical wool blend to wick moisture and stretch with your every move, the women's Kari Traa Sval Long-Sleeve base layer top keeps you warm and dry even when working up a sweat.

Ideal for days when the air is crisp and the frost might bite, the men's Saxx Viewfinder long-sleeve crew top is a soft, midweight base layer that keeps you toasty when you're exploring outdoors.