These cool socks are supersoft and made with aluminized threads woven into a breathable, nylon knit fabric Thin, sheer and lightweight to wear by themselves or as liners under your regular socks for a snug fit Ideal for all outdoor enthusiasts like hunters, hockey players, skiers, hikers and cold weather bikers Machine washable and dryer safe so there's no special cleaning required Perfect for everyone; unique socks for men and women in multiple sizes