O.P.B. - Optimized Pivoting Blade: During the kick cycle the structure of traditional fins creates a limit to the angle of which the blade can flex. This limit allows only a small part of the fin blade to push water in the direction of the kick, while the remaining part pushes the water in the opposite direction, reducing the diver's forward thrust. The O.P.B. system patented by Mares causes the blade to flex at an optimal angle during both the upward and downward strokes. This optimal angle allows the majority of the blade to push a larger volume of water in the proper direction and greatly increase efficiency. All of the diver's kicking effort translates into positive thrust. Traditional fins produce lower levels of thrust at different points in the kicking cycle with substantial differences between the maximum and minimum values. The O.P.B. system produces optimal thrust throughout every phase of the kicking cycle, which minimizes fatigue and produces a more fluid movement through the water. 

Riddled Foot Pocket: The limiting factors in traditional open heel foot pockets are their weight and the "parachute effect". When finning, water gets into the space between the bootie and the foot pocket, creating drag like the air in a parachute. The perforations prevent this and have the additional benefit of making the foot pocket very soft and flexible. Furthermore, the suction effect which can make doffling of the fins cumbersome, is now forever a thing of the past.