The Whispbar J-Cradle Kayak Carrier beautifully intergrates a full-featured kayak carrier with retractable load assist in a small, beautifully aerodynamic package. The J-style design and slide-out loading arms simplify loading from the side of your vehicle while maximizing your available crossbar space. This Carrier collapses into an aerodynamic, low-profile stowed position when not carrying boats, allowing you to leave the Whispbar WB400 J-Cradle Kayak Carriers on your roof rack without worrying about wind noise or collisions with your garage door frame. Whispbar's Quickdock Mounting System enables fast, solid, tool-free mounting of the J-Cradle Kayak Carriers to the T-Slots in a Whispbar Roof Rack or adapters are included to fit other roof rack profiles.