U.S. Divers Shredder Surf II Body Boarding and Body Surfing Fin Adult fin designed for body boarders, body surfers, and traveling snorkelers Dual-composite blade cups and channels the water efficiently for greater power Engineered to deliver power and speed while you conserve energy Adjustable foot strap, built-in leash system, and super-soft foot pocket Available in S (4 to 7), M (7 to 10), and L/XL (10 to 13); 2-year warranty