Mares New Volo Power Scuba Diving Fins - Silver (Size Small 6-9) Super Channel Thrust Technology System for Optimal Water Channeling 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 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