PowerStrider Shark (Black) (1 Pair Advanced Stilts) (Up to 151 Lbs.) Allows user to run up to 25 miles per hour and jump up to 8 feet in the air Replaceable footpads Extreme comfort "calf-cuff" has sectional padding for airflow and removable, washable lining Advanced-performing metal ratchet clips with easy-release and snow-board style bindings Cutting-edge, advanced-polymer leaf-spring technology