The Mystic Razor Boot is the boot that will answer your cold water needs. It's 5mm thickness which makes it toasty, packed with the most advanced technical features available today on a neoprene bootie for water sports. And to top it off, the sole is the Mystic REEF sole, which makes it reinforced (Kevlar) for protection from those sharp shells, reefs, or who knows what you can find on the bottom on the water or beach. If top of the line on your feet is what you are after - don't look any further!