ULTRA CHOKE FREE STEP IN REFLECTIVE DOG HARNESS AMERICAN RIVER CAMOUFLAGE GRAY ALL SIZES 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. The harness needs to fit snugly to work correctly Certified Break Strength Tested to 386 Lbs The New Camo Printed on Mesh Harness uses a Special Technique of printing patterns on mesh fabric. Double D-Ring Adds Strength. Same Color trim binding as the mesh. Safe Night Walking Reflective strips. Patented Conforming Shape Fit Seam Technology - Causes harness to conform to Dogs Chest curve.