Get the most out of your boots with the O'Neill Mutant 3 mm ST Boots. Made with FluidFlex™ Firewall for superior warmth, and a split toe for precise board control, you'll be the ruler of the waves, even when it's cold and the rest of your buds don't want to dip a toe in. Internally welded seams and glued and blindstitched seams give you superior waterproofing for the most comfort possible.