The design of the Wave FF fins has been seriously influenced by research in the field of improving the propeller blade. A large mass of water collects in the middle of the blade, from where, in accordance with the principle of the Mares Channel Thrust, is directed backward, creating a highly effective reactive thrust. The use of three materials means that we have the opportunity to choose the best thermoplastic rubber for galoshes, providing the diver with maximum comfort while at the same time using materials with optimum flexibility and rigidity for the blade, achieving the highest performance of the strokes.