Darn Tough's Colorado sock was designed to show the big mountains some big love. This burly, all-mountain performance sock has the perfect amount of cushioning along the bottom of the foot for extra support and comfort. Over-the-Calf height is ideal for skiing and riding in deep conditions while fine gauge Merino Wool provides legendary warmth without the bulk. And since Merino Wool is naturally antimicrobial this sock repels bacteria and odor. Still made in Vermont. Guaranteed for life.