Dickies Men's 3 Pack Industrial Strength Crew Socks 82% Cotton, 14% Polyester, 3% Nylon, 1% Spandex Imported Machine wash with similar colors. only non-chlorine bleach when needed. tumble dry medium. do not iron. Black extra-reinforcement pad, reinforced in all pressure points of heel,toe and toe cap for added durability and stain resister quality Reciprocated heel and toe for superior fit and comfort