Rottefella Flex Skate Hard is a hard flex for skate bindings. By changing to a hard flex the ski becomes more responsive, provides a firmer resistance and a quicker return of the ski. Can be advantageously used at high frequency, for example for sprinting.The flex is a flexible pad which provides bending resistance. It helps you control your skis and gives you better balance when skating. Rottefella MOVE, Xcelerator, QuickLock, Performance and Sport Screw bindings all come with an interchangeable medium flex. Choose from three different hardnesses depending on your weight and shoe size. We recommend you change your flex regularly as the rubber hardens over time. NOTE: The one we are selling is Grey not black as in Photo. Ours is HARD.Sold in Pairs