From kayaking to ice-climbing, whenever you need waterproof warmth without any loss of dexterity, wear these socks. Their secret is a patented three-layer membrane that lets perspiration out for comfort but prevents all moisture from penetrating. Made from a single piece of thin stretch material whose seamless structure reduces chafing and blisters, each one is pressure-tested for performance you can rely on. Our new fleece-lined version offers an added layer of soft, breathable warmth. Made in U.S.A.