Propel through the water with minimal effort thanks to the efficient design of the Volo Power Open Heel Fin. Comfortable and lightweight, the anatomic foot pocket features interior ribs that improve fit, prevent foot suction and less flexing, which sends more power to the blade. Ideal for all divers, the Optimized Pivoting Blade (OPB) turns your kick energy into an efficient thrust by maintaining an optimal angle. The result is a fluid swim and less fatigue. Two year limited warranty.Features:ABS Plus adjustable bucklesChannel Thrust: Grooves in the fin blade that moves you through water faster with less effortMaterial: Thermoplastic rubber/technopolymersWeight: 1.5lb (one fin without buckles)SizesSmallRegularExtra LargeBlade length14.2" (36cm.)14.6" (37cm.)14.6" (37cm.)