The FLF 2mm neoprene sock is the most advanced in the industry. How advanced? After years of using and abusing dive socks our crack team of dive sock experts compiled a list of features that we liked and put them all together in this sock. Features Include: Reinforced toe pocket for longer life. Non skid sole for less ice skating on the boat. Each sock is cut for a left or right foot for unsurpassed comfort. The top of each sock rests just above the ankle with an open cell seal to insure there's no slipping or sand getting in.