Engineered to grant the highest control and power transmission during finning action. The use of stiff material in the sole reduces flexing of the foot, resulting in more efficient finning action. The neoprene area around the ankle is made of super-elastic material. The lower section, in standard neoprene, ensures warmth and comfort. YKK zipper, with internal neoprene gasket to limit water seepage. Reinforcement on the toe and heel. Rear notch for securing the fin strap in place. Raised heel to aid balance when carryng the weight of equipment.