We reinvented long underwear with insulating Thermolite® technology and a micro-waffle texture for warmth without the weight.
You'll find a form-fitting base layer that sits close to your skin without the stuffed feeling of traditional thermal underwear. Built for winter layering under any outfit, WARMKNIT delivers genuine warmth through
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44 ratings
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Runs a size small. If you are 2XL, order 3XL.
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Bryan · March 12, 2026
Dream Purchase
My husband loves these "long johns" - this purchase is his second pair. They are the perfect weight for the cool and cooler days of the late fall and winter. We would whole heartily recommend their purchase.
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Constance · September 20, 2025
Great as a ski baselayer
My second pair, first pair still great but wanted a replacement when they wear out (I ski a lot). Incredibly warm, comfortable and a great fit. Use them for colder ski days, vs. a lighter patagonia set for warmer days.