Blue Dog Cat Pet Vehicle Safety Seat Belt Seatbelt Car Harness Vest Size Small S Size S: Neck Circumference 35cm - 43cm, Chest girth 30cm - 40cm, for pets under 10kg (10 - 20 Pounds) Breathable synthetic fabric with nylon webbing straps Durable buckles and adjustable strap Broad padded chest plate for extra protection and comfort Functions as an auto or walking harness?keep your dog safely restrained and secure