The Oceanic Manta Ray Open Heel Fins, inspired by nature, three advanced materials simulate the shape & mechanics of marine animals. Fin blades are made from techno-polymer advanced material that provides the strength of bone to maximize power, speed & efficiency, while being extremely lightweight & durable. Oceanic's Power-X System is a revolutionary material that acts as tendon & joint, optimizing propulsion by flexing during the down-stroke and releasing stored energy prior to the upstroke. Unique positioning allows the Power-X System to deliver maximum power to the blade while evenly distributing pressure over the foot to minimize fatigue. Blades have power channels that are flexible material simulates the elasticity of skin by directing water flow off the back of the blade for increased thrust. Inspired by aircraft technology, winglets along the length of the blade increase efficiency and improve maneuverability.