"Speedo’s cutting edge new Nemesis Fins are making waves in the swimming world. The most comfortable fitness and swim training fin on the market, Speedo’s new Nemesis Fin was designed using biomimicry and inspired by the pectoral fin of the Humpback Whale. The scalloped outer edge of the fins, like that of the Humpback Whale, creates greater surface area for water to pass over versus a smooth, straight edge. This technology creates enhanced propulsion, allowing the swimmer to push more water during kicking drills and training sets."