RC Pet Products Canine Friendly Vented Vest Harness Air Mesh Vest harness can be used as a car restraint, non-choking harness and chest protector all rolled into one easy to use device Made from breathable air mesh fabric that features soft quality webbing and nickel plated hardware Harness connects to seat belts with the seat belt attachment loop, making vehicle safety convenient Soft chest panel eliminates pressure points on shoulders, neck and chest Small fits dogs 15-25 pounds with a girth of 18-21.5" and a neck of 16",Review the sizing chart prior ordering the product.