Crash tested for your pets safety   A Pet Car Harness is your dog's protection while traveling in a vehicle. This model Pet 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 Pet Car Harness is made from strong ballistic nylon and fits comfortably on your dogs body with a lower chest design, adjustable straps ensure a great fit. Features DOES NOT WORK IN Hyundai Elantra GT DOES NOT WORK in Chevy Avalanche Extra Small & Small sizes are the red color, all other sizes are made in the gray color fabric.  These measurements are the largest diameter of the pet's chest, measure the widest part of the dogs chest right behind the front legs.   Chest inches (A) Harness Color X-Small 12- 16 inches Red & Black Small 15- 20 inches Red & Black Medium 19- 24 inches Grey & Black Large 25- 30 inches Grey & Black X-Large 31- 37 inches Grey & Black