Keep the dirt outside, not in your camper. The Extra Large Muk Mat&';s thick synthetic grass wipes sand and grit off your boots and holds it until you shake it out, so your floor stays clean from trailhead to beach. Size: 23.5" x 47", long enough to span your camper or van entry 40mm grass blades wipe away sand, dirt and grit High density pile traps the mess until you shake it out Two-layer backing holds the grass blades securely in place Waterproof binding prevents fraying UV protected to resist fading and sun damage Rolls up with velcro straps and includes a storage bag for travel Easy care: shake it out, rinse with warm soapy water, hang to dry