The EzyDog Harness features an EVA Chest Plate. EVA is a foam rubber that will form to the dogs chest for an Ergonomic Fit. The EVA Chest Plate keeps the load of the dog spread across the length of the dogs chest providing Comfort and Control, not to mention Style! The EzyDog Harness is adjustable and easy to fit. See the Fit Chart for the perfect fit. The EzyDog Harness uses Reflective Stitching for enhanced visibility at night. A Swiveling Seat Belt Restraint is included for safe travels by automobile. A Rust Proof Welded D-ring is used for attaching leashes. For Ultimate Control, use with an EzyDog Shock Absorbing Leash. For best fit measure the girth of the dog. This is the area behind the front legs and around the body. The neck will typically fall into place once girth is determined. If the measurement is close to the end of the size range, go up to the larger size.