This dog harness is good for dogs that have neck problems and can't wear a collar or harness that buckles around the neck. This harness is 5/8 inch wide 1-ply nylon with a metal buckle in sizes 14, 16 18 & 20. Chest Strap sizes are to center hole. 2" take-up and let out. Measure you dog around his chest. Order the size closest to his chest size. For example a size 14 harness will adjust from 12 inches to 16 inches. MADE IN THE USA!