OPEN HEEL DIVE FINS: JBL Longblade Polymer Fins deliver outstanding performance to help you dive deeper and stay there longer. These fins feature a best in class all new polymer blade. FLEXIBLE DESIGN: The reinforced base adds further rigidity to critical areas. This balance of stiffness and flex ensures that each kick translates to maximum thrust. These superior qualities are the result of an exclusive polymer blend of nylon and carbon fiber. CUSTOM FIT: Polymer blades are set at a 22 degree angle, following the natural geometry of the foot and leg. JBL open heel foot pockets allow for a custom fit without skimping on comfort or kick efficiency. HIGH PERFORMANCE: Designed with thee different rubber densities, the unique properties of each material enable peak performance throughout the pocket. Adjustable back straps ensure the perfect fit. Secured with screw and blade clips this allows for smaller storage, easy repairs, and upgrades. JBL INTERNATIONAL: Manufacturing spearfishing gear for over 40 years. The combination of our timeless designs and premium materials with legendary accuracy and bullet-proof durability has helped hunters like you stone game fish shot after shot.