Ninja Sox - No Show Socks with non-slip silicone pad on heel v3.0 Version 3.0. Completely re-engineered No Show Sock featuring the original Super Low Cut design (perfect no show look, even with TOM'S, loafers, boat shoes, mocs and sneakers) Improved, super low profile elastic threads for long lasting comfort and improved fit High quality terry soles for maximum absorption, durability and comfort Re-designed silicone no slip grips on the inside heel for improved grippiness MEDIUM socks fits shoe size 11-14; LARGE socks fits shoe size 14+