A Pet Car Harness is your dog's protection while traveling in a vehicle. This model car harness has been crash tested to the same standards as a child safety seat. Thirty (30) lbs. at 30 mph. There is a universal metal buckle that fits into the seat belt receptacle of your vehicle. The harness is made from strong ballistic nylon and fits comfortably on your dog’s body with a lower chest design; adjustable straps ensure a great fit. Extra Small & Small sizes are the red color; all other sizes are made in the gray color fabric.