Promate Pro Blade Scuba Dive Fins with Quick-Release Buckles Rubberized side ribs improve elasticity and stability and Channel Thrust Technology system for optimal water channeling Maintaining optimal thrust throughout every phase of the fining stroke minimizes fatigue Upper and lower stabilizers help transfer energy from foot pocket to the blade Soft rubber foot pocket, with ribbed insole for an improved fit and a dramatically more efficient fin stroke Quick-release fin buckles