Similar to the Arena Powerfin Pro 2 , however, this fin boasts a softer construction and prioritizes comfort, meaning the swimmer can do longer sets without any cramping. The shape of the blade allows the swimmer to catch more water than with any other fin. Designed with DMC's Patented Reverse V Rail (RVR) technology. RVR is geared to offer correct torque for each kick stroke, creating balance for the user unlike any other swim fins. The RVR streamlines vortexes more efficiently than any other design. Silicone material for maximum comfort.