Harness Lead is a leash and harness in one. It reduces pulling by gently tightening around the barrel of your dog. There is no tightening around the neck. It uses a dog's own pressure to encourage them to slow their pace. Please use it with kindness. Do not jerk, yank or correct your dog. The Harness Lead is escape resistant. However, it must be fit properly. Simply align the movable black stops to line up with the front leg and it will fit any body perfectly. Please use the Harness Lead as a walking tool only. Do not tie dogs out with one. Remember, the Harness Lead is not chew proof. Sizes: small/medium 14 lbs to 40; medium/large 40 lbs to 120 lbs Skillfully handcrafted in the U.S.A. Made of double braided polyester, tensile strength 3,000 lbs. Easy to use! instructions printed on the inside of the packaging.