This is the incredible Apollo Bio Fin Pro Series Open Heel Scuba Diving and Snorkeling Split Fins This wonderful fin features: Tester's Choice" per Scuba Diving Magazine November 2004 20° angle of blade ensures that the fin works with the natural resting angles of ankle and knee Up to 40% reduction in muscle fatigue, energy use, and air consumption; longest recorded bottom times during testing Increased maximum speed and reduced fatigue Consistently rated as the fastest fin in the water Excellent manueverability and position control Foot pocket is open at the toe for added comfort Easy quick release buckle system with finger loop 100% rubber with 65° durometer offers soft, comfortable foot pocket and the perfect amount of weight and flexibility for top speed with the least amount of effort and strain on your body. Your body will barely register the effort but you are definitely moving... and moving fast! "