ULTRA CHOKE FREE STEP IN REFLECTIVE DOG HARNESS AMERICAN RIVER OMBRE NORTHERN LIGHTS ALL SIZES Designer color blended. Bonded materials for long lasting wear. 3 inch straps allow for greater adjustment. Velcro Closure with buckle snap and leash D-ring. Patented Choke Free Design. Strength tested to 386 Lbs. V Cut Patented technology for better contoured fit. SIZE MEDIUM (Chest 16-19) 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.