Apollo Bio-Fin Pro Open Heel Scuba Diving Split Fins YELLOW Large for Scuba Dive Diving Snorkeling Swimming (Men's 9-11, Women's 10-12) (fin30) This is for a set of large YELLOW fins. "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