ULTRA CHOKE FREE STEP IN REFLECTIVE DOG HARNESS AMERICAN RIVER BROWN CAMO Patented Choke Free Design. Strength tested to 386 Lbs. V Cut Patented technology for better contoured fit 3 inch straps allow for greater adjustment. Velcro Closure with buckle snap and leash D-ring. Designer color blended. Bonded materials for long lasting wear. Please see image for sizing chart. Measure your pet according to size shown for proper fit. SIZE X-SMALL(Chest 11-13). 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.