The Vevor dog car seat cover back seat extender is designed to give pets more room and a stable riding surface in the back seat. Its hard-bottom construction supports up to 400 lbs and helps prevent sagging during travel. The multi-layer waterproof design protects seats from scratches, dirt, spills, and pet messes. A breathable mesh panel, storage pockets, and included safety belt add comfort and convenience for everyday trips. The cover is also removable and washable for easy maintenance.