Fin grippers are essential to help keep your full foot fins in place. These Aqua fin grippers come in two sizes, medium and large, and are a necessity if you find that during your dive your fins get loose or fall off. Fin Grippers are a handy way to keep fins secure and in place in multiple situations. If you need to enter water in heavy surf conditions the fin keeper helps keep fins firmly in place. The Fin Keepers allow you to wear fins that may be slightly loose on your feet. They also keep fins in place when you need that extra burst of speed when on the hunt for trophy fish. The Fin Grippers are a "Y" shaped strap that you place one arms of the Y across the bridge of the fin foot pocket, one arm under the foot pocket and the third across the back of the foot pocket heel. This device will keep fins secure in most all conditions.