Start with a high-performing next-to-skin layer and take advantage of the snow. The women's REI Co-op Midweight Base Layer Tights have a smooth face for easy layering and brushed interior for warmth.

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Make your kiddo's base layer the warm, breathable, kids' REI Co-op Midweight Crew long underwear top and they'll play happily outside all day. It's great on its own for inside play, too.

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Make your tot's base layer the warm, breathable, toddlers' REI Co-op Midweight Crew long underwear top and they'll play happily outside all day. It's great on its own for inside play, too.

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The kids' REI Co-op Midweight Long Underwear Bottoms are warm and very good at wicking moisture, making them an ideal base layer for highly aerobic cold-weather fun, like skiing and snowshoeing.

base-layer-bottoms

The toddlers' REI Co-op Midweight Long Underwear Bottoms are warm and very good at wicking moisture, making them an ideal base layer for highly aerobic cold-weather fun, like skiing and snowshoeing.

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Warm and wicking to keep you comfortable on the slopes, the men's REI Co-op Midweight Long-Sleeve Base Layer has a smooth face to easy layering and a brushed back for warmth against the cold.

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Wherever you're out in the cold, you'll love the streamlined warmth, moisture-wicking comfort and easy layering of the women's REI Co-op Midweight long-sleeve base layer top.

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Shred to your heart's content with the comfort of these men's Midweight X base layer bottoms. They're your quiver-of-one, serving up quick-drying, stink-free warmth for long days on the mountain.

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Begin your layering system with a flexible base that moves with you. The men's Burton Midweight X Base Layer Crew top also breathes with your body heat and helps control odors.

base-layer-tops

Begin your layering system with a flexible base that moves with you. The women's Burton Midweight X Base Layer Crew top also breathes with your body heat and helps control odors.

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Pull up the hood, deploy the face mask and ride into the weather. The women's Burton Midweight X Base Layer Long Neck hoodie keeps you comfy with a built-in neck warmer and breathable fabric.

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Pull up the hood, deploy the face mask and ride into the weather. The men's Burton Midweight X base layer long-neck hoodie keeps you comfy with a built-in neck warmer and breathable fabric.

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Hit the lifts with all you've got. The women's Burton Midweight X base layer pants move right along with you with breathable, quick-drying fabric—plus, a media port stashes your phone for easy access.

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Sleek, smooth and comfortable, the women's ExOfficio Modern Collection hipster underwear offers dynamic technical performance for all your travels, both near and far.

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