Athletic Ribbed , Terry Loop In Forefoot, Heel, And Toe For Medium Cushion , 82% Cotton, 16% Polyester, 2% Elastane , Machine wash at 40°c, Avoid bleaching or ironing, Socks will last longer if you keep them out of the dryer , M556C18ICO-OLV-M , Arch Support , Reinforced Heel & Toe , Seamless Toe Closure