The RetraxOne XR is a retractable polycarbonate series bed cover constructed from a one piece sheet of polycarbonate, engineered to retract without joints or hinges. The RetraxOne XR combines strong, durable polycarbonate with an incredible scratch resistant matte finish. The low profile design gives the RetraxOne XR tonneau cover an overall streamline appearance and a superiorly firm seal. The RetraxOne XR optimizes cargo capacity with the cover open or closed, providing the ultimate versatility in cargo management. The Trax Rail System will work with most T-slot accessories from Yakima, Thule, Rhino Rack and many more offering endless possibilities. The pairing of Trax Rail System with accessories offers double the cargo capacity. This unique technology frees up the hitch with the ability to mount bikes, coolers, outdoor gear and more on top of the bed cover by combining the Trax Rail System with the t-slot accessories. If you have any questions about RetraxOne XR tonneau covers give us a call at 800-272-5362.