CHOKE FREE REFLECTIVE STEP IN ULTRA HARNESS - BLACK AMERICAN RIVER Trachea Safe: Choke-free patented design pulls from the chest ONLY Easy to Use -Step in, wrap up and go! Reflective strips for safe night walking Soft Mesh Polyester / Machine Wash and Line Dry SIZE LARGE(Chest 19-21). IMPORTANT: Measure the CHEST only, just behind the front legs. If your dog is on the borderline between sizes, always GO DOWN to the lower size, not up. The harness needs to fit snugly to work correctly.