88% THOR·LON Acrylic, 10% stretch nylon, 2% spandex * Extra THOR·LON provides a maximum fitness density padding for better durability, protection against shock, impact, and shear forces * These socks are unisex sizing, please see sizing chart under images or under product descriptions for sizing. * Lightweight padding in arch provides arch support and a better fit * Machine wash warm or cold with like colors, use non-chlorine bleach only, tumble dry low