The new OPB (Optimized Pivoting Blade) patented system in a lightweight and high-performance full-foot fin. Blade with OPB system to optimize the lift angle during the fining action. 30% improved performance compared with traditional fins. Rib edges and blade tips in soft, thermoplastic rubber, for greater resistance against fatigue. Soft, orthopedic foot pocket, for greater comfort and efficiency. Stabilizers, for greater stability and torsional stress reduction on the ankle during the fining action.