The ultimate sock! A sock within a sock, the inner layer moves with your foot, the outer layer moves with your shoe, eliminating friction on the skin and reducing wear. The unique, fine double layer construction gives outstanding comfort, with no blisters and no wearout within a thousand miles of use....guaranteed! The Aegis Microbe Shield anti-bacterial treatment keeps your feet fresh and odour free all day long. S(3-5.5). M(6-8.5). 74% cotton, 24% nylon, 2% Lycra. Machine wash