The Alpinestars GP Sport Evo Knee Slider offers high quality protection and feel, and can be used on all standard Alpinestars Leather Suits.PU Compound construction is durable and allows good feelShaped for optimal contact, even wear distributionDesign which is lighter in weightStandard fitment on all Alpinestars Leather SuitsThe Alpinestars GP Sport Evo Knee Slider has been made from a PU Compound construction which is durable and allows good feel. The Sliders have been designed to be lighter in weight, and have a shaped which is great for optimal contact, and ensures even wear.