Super Channel Thrust Technology System for Optimal Water Channeling; Tri Material Construction Provides Superior Performance & Maximum Elasticity; Maintaining Optimal Thrust Throughout Every Phase of the Finning Stroke Minimizes Fatigue; OPB (Optimized Pivoting Blade) Fin Technology that ensures the blade is always at an optimal angle during both the up and down stroke; Riddled Foot Prevent from Entering The Space Between the Boo. tie and the Foot Pocket which would Normally Create a Parachute Type Drag; Soft Anatomical Foot Pocket with Ribbed Insole for an Improved Fit and a Dramatically More Efficient Fin Stroke; ABS (Adjustable Binding System) Fin Buckles with One Finger Release