Heavy Use New high performance blade for extreme diving. Innovative operating OPB system (Optimized Pivoting Blade) - patented. New anatomical foot-pocket provides even more comfort, makes donning easier, increases sole rigidity, and enhances the effort of the finning stroke. New hi-tech technopolymers. Great flexibility, long-lasting, light-weight and wear-resistant. Differential foot pocket and blade thickness. Blade and foot pocket sections are optimally thickened in each sections; the result of meticulous computer aided structural design. Optimal blade/foot pocket angle provides maximum thrust through every phase of the finning stroke. New ABS buckle with slider catch security system.