The Hull Raiser kayak cradles hold any touring, whitewater or recreational kayak. They're compatible with round, square and most factory crossbars directly out of the box. You'll have easier access to gear stored in your boat, and more room on your crossbars for bikes, cargo boxes, and other boats. Universal cradle design fits any kayak. Includes two padded Heavy Duty Straps to secure the boat and a pair of Bow/Stern Tie Downs. J-Cradles mount directly to factory roof rack crossbars. The base pads are made of Dynaflex™ and the upper pads of closed cell foam, for protection of your boats finish.