IST Bora Bora Scuba or Snorkeling Open Heel Fins Scuba Dive Diving Divers Fin Snorkeling Snorkel Fins Authorized Dealer Full Warranty Tropical open heel strap fins. Designed to perform with high power and robust energy. Maximum propulsion without straining leg muscles. Rubber grip under foot pocket to prevent slippage. Underside drain hole for fast and efficient water drainage.