58% NuWool (compact spun Merino) 38% Nylon 4% Lycra * Offers an ultra-thin fit providing the thinnest possible interface between one"s foot and their shoe. * The Lightweight is the best sock to complement any minimilist footwear. * Machine wash on warm or hand wash your toesocks after each use, and line dry. Do not machine dry or dry clean your toesocks. * China