Cozy base layer bottoms for milder winter days and year-round layering, the Icebreaker 200 Oasis kids' leggings harness the natural benefits of merino wool to keep them comfy and warm.

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Harnessing the natural benefits of merino wool, the kids' Icebreaker 200 Oasis Crewe long-sleeve is an ideal base layer top for milder winter days and year-round layering.

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Keeping kids warm and comfortable on action-packed winter adventures, the Odlo Active Warm Eco base layer top offers advanced thermoregulation and warmth while allowing a full range of movement.

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Show your young ones that snow and ice are fun with the right gear. The kids' Odlo Active X-Warm long-sleeve base layer top wicks moisture and has cozy fleece inserts to keep them warm and dry.

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From dance class to capture the flag and beyond, this girls' Athleta All Day Longline bra provides soft, supportive comfort and moisture management to keep her moving with ease.

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Extend their outdoor fun into the shoulder seasons by layering them up in the kids' Threads 4 Thought base layer set. It's soft and and stretchy and adds just-right warmth on chilly days.

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Extend your outdoor fun into the shoulder seasons by layering your toddler up in the Threads 4 Thought base layer set. It's soft and and stretchy and adds just-right warmth on chilly days.

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Tackle the cold without sacrificing on-mountain mobility in this Obermeyer Clara quarter-zip base layer top. Soft and stretchy and with flat seams, it's a comfy layer with a dynamic, natural fit.

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When the mercury dips and your kiddo heads out to play, the kids' Smartwool Classic Thermal Merino base layer bottoms offer breathability, natural stretch and a layer of warmth for cold-weather fun.

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Yoga-inspired leggings with ample stretch in the single-sided brushed stretch jersey knit, Obemeyer Courtnay leggings provide unrestricted movement and an active fit.

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A versatile winter essential, the girls' Obermeyer Courtnay leggings can be worn as a base layer on the mountain or casual pants back at the lodge.

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This buttery soft, non-itchy tasc Performance Elevation Merino Fusion base layer set for kids will keep them warm while naturally wicking moisture from their body to keep them comfortable.

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This buttery soft, non-itchy tasc Performance Elevation Merino Fusion base layer set for toddlers will keep them warm while naturally wicking moisture from their body to keep them comfortable.

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Start layering your little ones with the toddlers' warm, breathable REI Co-op Lightweight Crew Long Underwear top. It features a made-to-move design and all of the comfy for a day of play.

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