The Mares Volo scuba fin is a gigantic leap forward in fin technology. This fin is so revolutionary; it is covered by 8 different patents. The Volo uses Mares Optimized Pivoting Blade system (OPB); the Volo is 30% more efficient than traditional fins. The OPB allows the blade to maintain an optimal angle throughout the kicking cycle, whereas traditional fins achieve this only during a small portion of the cycle, OPB produces a constant thrust, which minimizes fatigue and produces fluid movement through the water. The Mares Volo also allows you to use alternate kick strokes not possible with splits fins.