The SportRack Kayak Carrier J Stacker Car Rack delivers an easy to use and convenient j-cradle style kayak loading/unloading design. The J Stacker uses up much less crossbar space than conventional kayak racks that carry the kayak laying flat on kyak saddles, by carring the kayak semi-vertically on its side using up much less roof rack cross bar space to allow attaching another J Stacker or other gear carriers. This rack works with all types of kayak shapes - sea, ocean, whitewater, tandem kayaks and more. The J Stacker mounts directly to all Thule roof rack load bars (square, oval Rapid Aero & Xsporter truck rack), Inno Racks square cross bars, Yakima round crossbars and virtually all factory roof rack crossbars. Includes both front and rear fully padded j-cradles and all mounting, safety & stability hardware including universal car rack crossbar mounting clamps, 2 heavy-duty straps with cam-buckles and a pair of bow & stern tie downs with galvanized steel bumper hooks to secure kayak to the front and rear of the vehicle. Thule Racks recently purchased the SportRack Car Rack Company as the ideal complement to Thule Racks premium line of car rack products. The SportRack line of products combines safety, durability, innovation and high quality with unbeatable inexpensive & affordable prices!