The Non-Skid Roof Pad is designed to keep your car top carrier from shifting on the roof of your vehicle. It also protects your vehicle’s roof from damage caused by sharp-edged objects inside the carrier. Measuring in at 36” L x 36” W, the pad is sized for use with all Rightline Gear Car Top Carriers and Car Top Duffle Bags. The Non-Skid Roof Pad is especially recommended when using car top carriers on vehicles WITHOUT a roof rack.