Alpinestars Gp Pro Knee Slider - BlackAlpinestars Gp Pro Knee Slider Anatomically profiled and constructed from a proprietary polymer compound the GP Knee Slider features strong velcro for secure fitment to a range of performance riding suits. Feature: Developed extensively in MotoGP and World Superbike. Constructed using an exclusive polymer compound that is durable yet allows good feel in turns. Anatomically shaped for optimal contact, even wear distribution and lighter weight. Standard