IST F4 Jet Fins US Military Navy Seal Special Ops Rescue Salvage Diving (X-Large)

IST Propulsion Rubber FinsF4 Propulsion represents the latest evolution of Military-style Fins from IST.Based on IST's iconic and military favorite F-1, the F4's wide blade design is slightly shorter – however, there is no power shortage here. That’s because of the expanded width rubber blade which incorporates unheard-of flexibility. Even more thrust is attained by 3 deep vents which force water backwards, emulating the effect of three synchronized turbo-powered water jets.The F-4 is excellent for open water dive missions, but also shows its skill in assisting diver- maneuverability within confined spaces. As you would expect and demand of a military fin, the F-4 is durable and long-lasting; compatible with IST’s famous Universal clamp stainless steel coil spring fin strap. There’s a reason U.S. Military Personnel have made IST's exclusive F1 Deep Sea Scuba Diving Military Rubber Rocket Fins their number one choice. The F-4 is following the tradition, already a favorite with the U.S. Navy.FEATURESThe fin is not only useful in the ocean but also capable of handling technical dive missions in underwater confined spaces.The choice of material makes Propulsion durable and long lasting IST stainless steel spring fin strap compatible (item no.: FS10)The fin is useful in open water but also capable of handling dive missions in confined spaces. Propulsion represents a new generation of rubber fin. The fin is designed slightly shorter but no power is lost through its wider blade rubber’s unmatched flexibility. In fact, more thrust is gained by 3 deep vents, which force water backwards, mimicking the effect of the water jet.Durable and long lasting.Sizes: M (US 7-9 EUR 36-38), L (US 10-11 EUR 39-42), XL (US 11-13 EUR 43-36)