The Non-Skid Roof Pad from Rightline Gear is designed to prevent your car top carrier from shifting during use. It also protects your vehicle"s roof from scratches and dings caused by hard-edged items inside the carrier. Suitable for use with all Rightline Gear Car Top Carriers and Car Top Duffle Bags, this 36x36-inch pad can easily be cut for a custom fit. It is especially recommended when using a car top carrier without a roof rack.