Outer:80%nylon/20%lycra. Inner: 100% Polyester. Waterproof: The sock is 100% waterproof and Seamless. Breathable: Highly breathable, keep your feet dry and warm. Materials: Outer:80%Nylon/20%Lycra. Inner: 100% Polyester. Versatile: ideal for any outdoor activities, such as Hiking, Trekking, Cycling, Mountain climbing, Hunting and Running.. Washing instructions: Hand wash or machine wash below 40??C and hang dry. Do not iron. Do not bleach. Do not dry clean.