Ausangate Alpacor Heel Tab Socks For Men 75% Alpacor/ 23% Nylon/ 2% Spandex Imported Heel tab protects ankles from chafing and blistering Cushioned terry lining from heel to toe for added comfort. Heel tab helps protect upper ankle from blisters. Naturally hypoallergenic and ideal for people with sensitive skin. Flat toe seam. Machine wash and dry alpaca fiber socks.