Men's Drylock Split Toe Boot 5mmEngineered 3D Warmth and Comfort. This 3 dimensional boot contours the foot while minimizing excess bottom rubber to make for a true board feel. The Celliant Black with Channel Flex makes it warm and comfortable. The Drylock Cuff opening prevents flushing, the ergonomic strap keeps your heel in the pocket and pressure off your instep, and the heel strap makes for easy pull up.