The Velocity X3 accelerates with lightning speed as water comes into contact with the textured blade. Faster and more efficient, the Velocity X3 maintains comfort and control while enabling you to exert less effort, stress and strain with each stride.During the fin stroke, water flow is directed through our exclusive Power Enhancing Vents (PEVs) and off the fin tips, creating lift and forward propulsion. So much so, that the Velocity X3 is the only paddle fin that benefits from Natures Wing Propeller Fin Technology. This helps reduce the stress on the divers leg while accelerating water over the blade; resulting in increased velocity. Water movement through the PEVs also reduce lateral movement of the fin (wasted energy), increasing the efficiency of the kick.