An ultralight base layer designed to manage sweat during high-intensity activities, the women's Icebreaker 125 ZoneKnit leggings keeps you comfortable when you're moving fast.

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Freeride in cozy comfort with the women's Ortovox 185 Rock'n'wool short base layer pants. Made with soft, warm merino wool, they ensure the going won't get tough when the weather gets cold.

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Made with classic merino jersey fabric, the women's Icebreaker 200 Oasis leggings provide the natural benefits of merino wool in a highly versatile, highly comfortable design.

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Crafted from the softest Peruvian alpaca wool, the women's Arms of the Andes 300 Lightweight Alpaca Wool leggings withstand tough environments and help keep you comfortable in any climate.

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For hard training workouts and active lifestyles, Craft Active Intensity women's base layer pants help you regulate your body temperature for extended comfort no matter what you plan to conquer.

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Reward your hardworking legs with hardworking warmth. Made with superfine merino wool, these women's Artilect Boulder 125 leggings deliver softness, breathability and a prime warmth-to-weight ratio.

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The women's Patagonia Capilene Air base layer bottoms insulate even when wet, dry quickly and resist odors, offering the greatest range of warmth and comfort of any Patagonia base layers.

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Warm, breathable and quick-drying, the women's Patagonia Capilene Midweight base layer bottoms feature HeiQ® Fresh durable odor control for daily use.

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These women's base layer bottoms keep you warm and dry in seriously cold weather during technical alpine routes.

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When layering for mild-weather adventures, start with the women's Smartwool Classic All-Season Merino base layer bottoms. They're made from lightweight jersey with a supersoft next-to-skin feel.

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Update your cold-weather kit with tights that adapt to your activity. Smartwool Classic Thermal Merino base layer bottoms offer cozy warmth for stop-and-go activities and feature an improved fit.

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Serving up warmth for stop-and-go activities and an improved fit, the women's Smartwool Classic Thermal Merino base layer bottoms in plus sizes are a reliable, cozy addition to your cold-weather kit.

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Whether you layer them or wear them on their own, Obermeyer Discover tights offer a flatseam construction for comfort, a soft brushed interior and fun one-of-a-kind colors and prints.

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Great for layering to add warmth on active days out—or wearing solo cozied up in your tent—the women's Kari Traa Elenore base layer tights are made with soft wool for a comfortable next-to-skin feel.

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