Rightline Gear 100650 Non-Skid Roof Pad for Soft Car Top Carriers Dimensions: 36 L x 36 W Solid polyester re-enforced pvc material; much higher quality than roof pad materials constructed with holes. Prevents car top carrier bags from shifting in transit  highest gripping material on the market Protects roof from sharp edged objects inside bags Can be cut to size for use with any carrier Recommended when using Rightline Gear Car Top Carriers on vehicles without a roof rack