SAFETY DESIGN: The leash is shortened so pet can't jump out, and the leash has rotary metal hook which prevents pet get entangled and choked, and not breaks like plastic ones. The pet car seat can be fixed securely to both front and back car seat by the headrest strap and the 2 tabs inserted in the cushion seam. STURDY STRUCTURE: Internal PVC frame makes our dog car seats very strong, and it is upgraded with velcro straps at 4 corners. When zipped up and velcro fastened, the product is much stronger than others LARGE & WATERPROOF: Ideal size @ 15'(L)*15'(W)*10'(H), plenty of room for small pets to snooze inside. Oxford waterproof cloth prevents liquid leaking, protecting your car from dirt, dander, and spills. EASY TO ASSEMBLE, STORAGE & CLEAN: Easy and quick to install and remove on both front and back seat, folds away compact for storage, and the cover is machine washable.