These easy kicking fins feature OPB and Channel Thrust Technology—a knockout combination that allows you toIncrease your efficiency in the water with minimum effort! Optimized Pivoting Blade helps you control and optimize thrust angle while Channel Thrust Technology helps rout water flow. Rubber covered stabilizers provide improved performance. Two year limited warranty.Sizes40424446Blade14 1/2" (36.5cm.)14 5/8" (37cm.)15 5/8" (39.5cm.)15 5/8" (39.5cm.)*Blade is measured from end of footpocket to end of blade.