The Tusa Sf0104 Hyflex Switch is powered by Pu Ri Ma X 'Polyurethane Blade System'. The Polyurethane blade provides a quick 'snappy' response to the diver's every movement. TUSA's unique 'Vortex Generator' effectively reduces water resistance through the fin stroke normally found on traditional smooth blades. TUSA's Multi-compound foot pocket increases power transfer to the fin blade. The Tusa Hyflex Switch is equipped with the new Universal Bungee Strap providing extraordinary comfort.