The TUSA Hyflex Switch is powered by PuRiMaX 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. The Vortex Generator consists of six (6) performance ridges positioned behind the blade vent reduce resistance, creating a smoother and more efficient kick cycle. 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. The heavy duty elastic fin strap provides easy donning and doffing of fins. The quick adjustment accommodates five (5) adjustable positions. Fin strap is equipped with a large extruded rubber heel cushion with large finger loop for easy donning and doffing. Angled Blade Design (A.B.D.): A standard flat fin inhibits propulsion solely by fault of design. An angle between the heel of the foot and the calf of the leg remains when the leg is extended to kick. This angle causes approximately 10% of the propulsion to be lost. The Angled Blade Design accommodates for this anatomical characteristic and ensures maximum efficiency throughout the kicking cycle. TUSA Hyflex System for a compact and lightweight travel package. Fin is available in multiple colors and sizes.