Tomily Non-Skid Silicone Patch No Show Cotton Liner Boat Invisible Socks 2 Pairs 65% cotton Material:Cotton+Silicone+Ice Silk,100% Brand New and High Quality,Value Pack,2 Pairs Pack. Size:size feet35-37S/M),size feet38-42(L/XL) Elastic Comfortable Flat Boat Line Socks of Silicone Anti-Slip Heel Grip Machine Washable Also,durable.With silicone anti-slip heel.Hugs your feet & won't slip off. Good Matching for All Your Sneakers, Boat Shoes, Loafers, etc