The Form Seatbelt extension part, which is made of durable nylon, is adjustable and easy to attach to the vehicle’s seat belt slot. With the help of the seat belt extension, the Rukka Form harness transforms into a safety belt harness. There is a stylish gunmetal finish on the rotating snap hook and other metal parts. Please make sure that the seat belt extension fits your vehicle’s seat belt slot. The product is not compatible, for instance, with the following car brands: Ford, Volvo, Saab, Chevrolet or Subaru. PLEASE NOTE: Do not leave the dog alone in the vehicle when attached to the seat.