Heavy Cordura Nylon covered foam rack pads that fit on existing rack or car dealers generic racks. Velcro holds pad onto rack. Comes complete with 2 rack pads with adjustable straps and buckles. Holds up to 3 boards. I was impressed with how easily they installed on my wife's car. I've sold a lot of these racks and I have compared them to the other brands and these are the best racks of this type on the market. The owner and designer, Larry Block was also the inventor of the Surf Leash..