GIVE YOUR DOG A COMFORTABLE ENVIRONMENT Backseat extender for dogs creates a cozy dog car hammock hard bottom by filling the gap between seats. Built in with load-bearing plates. Providing powerful support of up to 350 pounds for your dog, it is the ideal choice for large dogs and multiple pet families. STRICT MATERIAL SELECTION The dog seat cover is made of 7-layer high-quality fabric and thickened PP hollow board. The high-quality material is combined with TPU waterproof layer, so there is no odor.100% scratch-proof and waterproof, fully protecting your car seats from scratches, dirt and pet drool. STORAGE POCKETS AND MESH WINDOW The back seat extender with hard bottom also has a mesh window and 2 storage pockets.