Omega Flip Fin Stealth MAX Military and Rescue Style Scuba Diving Fins Patented Flipfin design provides total mobility in and out of the water Two-piece hinged fin allows blades to fold up to allow full mobility out of the water and click down with a first kick once in the water Stealth Max model's long blade providesmaximum thrustand unbeatable performance and efficiency with minimum effort in the open water Flip Fins are used by US Navy Seal Teams, SOCOM and Air Force Rescue Teams Find your correct size: Large for Men's US shoe size 9-11, X-Large for Men's US shoe size 11-14