Omega Flip Fin Amphibian Scuba Diving Fin Flip Fins are used by US Navy Seal Teams, SOCOM and Air Force Rescue Teams Patented Flipfin design provides total mobility in and out of the water with easy transition from water to land Two-piece fin with special Aqua-Hinge allows them to fold up out of the way for full mobility on land; click down with a first kick once in the water Blade design offers Maximum Propulsion with minimum effort Find your correct size: Medium for Men's US shoe size 6-8, Large for Men's US shoe size 9-11, X-Large for Men's US shoe size 11-14