CLOSED HEEL DIVE FINS: When designing the second generation polymer longfin we set out to create something with the performance of our flagship carbon fiber fins but at a cost for everyone. We created an all new blade made from a proprietary carbon – nylon blend that replicates the properties of its carbon cousin. FLEXIBLE DESIGN: Its reinforced base is stiff and responsive. From there it becomes progressively thinner and more flexible, allowing for maximum energy transfer. Pockets and blades are modular. Secured with screws and blade clips. This allows for smaller storage, easy repairs, and upgrades on your dive fins. HIGH PERFORMANCE: We mated this amazing blade to our newly developed tri-density foot pocket. It features three unique rubber blends that work together to create a pocket that is stiff, responsive, and soft in areas where it matters most. The result is performance freedive fins that kick well above the competition. FEATURES: These dive fins feature a 22° Blade Angle, Proprietary Carbon – Nylon Polymer Blade, Tri-density Full Foot Pocket, Stiff Foot Pocket Bed for Enhanced Thrust, Soft Foot Pocket Upper for Reduced Foot Fatigue, Modular Design, and Embedded JBL Tuna Coffin Logo. JBL INTERNATIONAL: Backed by over 50 years of experience, our spearfishing gear combines timeless designs with premium materials to deliver legendary accuracy and unmatched durability. Our commitment to the highest quality allows hunters like you to depend on our gear, shot after shot. The ultimate footpocket meets the ultimate composite blade. Meet the second generation JBL Polymer Longblade Fin.