Men's Neoprene Slipper Socks, Dive sock, Fin Sock, Shoe Covers, neoprene sock, Cycling, Gloves, Hats and Socks and Shoe Covers NSK-010 Fin's Skin SocksUse these handy skin socks to prevent blisters and chafing from fin use. Nylon / Lycra Small: Men 2-5, Women 3-6Medium: Men 6-9, Women 7-10Large: Men 10-14, Women 11-15 NSK-010 Fin's Skin Socks