Fins Cressi-sub Master Frog- The first strap-on fin, molded with the exclusive and patented 3-material Cressi system. The blade is made of powerful polypropylene with unsurpassed reactivity, the side members and reinforcements are molded in resistant copolymer, while the foot housing is in a soft and comfortable thermoplastic (elastomer). The rather long blade, derived directly from the freediving model Gara 2000, allows you to make the most of the exceptional elastic-propulsive power of the material. The computer-designed and highly anatomical foot housing ensures perfect foot locking, allowing ideal transmission of leg-fin forces. Master Frog is the purosague of the Cressi range, in the category of strap fins. Its power is proverbial, also linked to a lightness of the fin that minimizes inertial masses, to the advantage of the effort-performance ratio. It is the fin preferred by instructors, professionals and technical divers, who find in it an unmatched propulsive tool, ready to push like a horse at a gallop even in the worst situations of attitude and current. The absence of side rails in the final part of the blade allows the fin to drift easily into the water, alternating powerful strides with frog strokes, to break the continuity of effort and to be able to extend the fin indefinitely.