This Glory Max winter thermal socks are made of 91% Acrylic, 5% Nylon, 3% Polyester, and 1% Elastain, which are soft, comfortable, and warm. The socks are crew length high, made with terry loop cushioned inside to provide warmth to the entire foot. The socks have a 2.13 tog rating, which is suitable for winter outdoor use. Each set of socks comes wiht black, navy, and gray colors. These socks are machine washable and can be dried in a low temperature. They are suitable for US men shoes size 7-13.