Injinji 2012 Outdoor Wool Original Weight Crew Toe Socks 70% Wool/ 25% Nylon/ 5% Lycra Imported 70% Nwool  25% Nylon   5% Lycra Constructed with Injinjis exclusive renewable and biodegradable Nwool fiber, a blend of soft Merino Wool, Nylon and Lycra Climate-regulating Nwool adjusts with the temperature, keeping feet warm in cold weather and cool in hot weather 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