UltraGroove Metal(TM) is a retractable tonneau that makes it easy to attach nearly any Thule(R) or Yakima(R) rack to carry bikes, kayaks, cargo baskets and more. It offers truck owners the metal look with heavy-gauge aluminum panels and a tough, powder-coated, matte-black surface. With or without racks, UltraGroove Metal is a great-looking retractable tonneau that's incredibly easy to use. It opens quickly with just a turn of the lock knob and closes just as easily with a pull on the built-in strap. " The built-in RES(TM) rail expansion system can quickly be outfitted with racks to carry your recreational gear.