This is the Mares Avanti Super Channel OH Open Heel Scuba Fins Features: Brand new & completely redesigned Channel Thrust Technology system for optimal water channeling Maintaining optimal thrust throughout every phase of the fining stroke minimizes fatigue Soft anatomical foot pocket with ribbed insole for an improved fit and a dramatically more efficient fin stroke ABS Plus (Adjustable Binding System) Fin Buckles - one finger release The Avanti Superchannel is designed for the diver who wants the perfect blend of power and efficiency in one fin. The new blade design with a large central Superchannel and two traditional lateral channels provide excellent thrust while maintaining high efficiency and minimizing leg fatigue.