Alfie Pet by Petoga Couture - Kerry Car Vehicle Safety Seat Belt Harness with Tether and Microfiber Fast-Dry Washcloth Set Best fit breast girth: 12" - 14". Tether measures 18" - 30.5" in length and 1" wide. Sizing for each dog is unique. Similar to our clothing and accessory, medium size from one designer is not the same for another. For example our 9-pound yorkie model usually fits either one of three sizes (i.e. XS, S, M) depending on the designer. We highly recommend you measure your pet precisely with a flexible tape measure to ensure the best fit. Contact us if you have question. We are happy to help. Designed for pet's safety while riding in vehicles. Made from strength-rated material with padded safety vest. Durable buckles and adjustable strap. Any seatbelt can go through the harness back and install easily in all vehicles. Comes along with a seat belt tether. Can also be used as regular harness. Alfie Microfiber Fast-Dry Pet Drying Towel is made of a specially designed, ultra-tightly woven material, known for its excellent absorption and ultra-fast drying speed. Measures 12.75 x 12.75 - washcloth size. Absorb up to eight times its own weight in water, quickly allowing you to dry your pet much faster than traditional cotton towels.