Bisiso Back Seat Extender is made of waterproof, scratch resistant and non-slippery materials. The product provides 40% extra space for dogs in the back seat area. The hard panels will prevent dogs from falling into the gap. It will form a platform like a bridge to support a weight up to 400 pounds. Even large dogs can stay on it safely and comfortably. The extender can be installed on cars, sedans, SUVs, or trucks with the help of the adjustable straps. It can also serve as a backseat mattress or a gap filler which people and pets can sleep on. The area below the bridge can be used as storage. The product includes a dog safety belt and will have openings for seat belt buckle sockets.