OMS Slipstream Fins X-LargeA fin so revolutionary that the U.S. Navy cut their swim time by 1 minute on a 500 Meter Swim!Features of OMS Slipstream Fins X-Large OMS Monoprene Slipstream Scuba Diving High Performance Fins | Comfortable foot pocket, A lightweight, neutrally buoyant Monoprene resin | A proven fin design that results in better trim pos..