Developed in Hawaii with input from world renowned pros such as Mark Cunningham and Brian Keaulana, Da FIN was granted a U.S. Patent for its original design. Da FIN combines unparalleled comfort with exacting construction to creat a swim fin that performs under the most extreme conditions. The side rails---the "strakes"--- on Da FIN are rock solid but only run about half way down the length of the fin where they angle back to the blade. This forces the fin to flex right at this critical point. The raised v-shape foot pocket combined with a stiff blade working together at the point of flex creates maximum acceleration of the water flowing over the fin surface resulting in more thrust per kick with less effort. For such a powerful fin, it is unusually light in weight. Da FIN floats in the ocean and there is no right or left foot difference so Da FIN can be worn on either foot. Da FIN is the #1 choice of lifeguards, bodysurfers, and top waterman around the world and is standard issue equipment for more than 40 municipal lifequard and surf rescue agencies in the USA.