Loghot Pet Vest Harness for Dogs with Adjustable Nylon Protective Harness Leashes High quality nlyon oxford cloth. Zinc alloy buckle traction: high quality zinc alloy material with anti-corrosion, high hardness, no deformation, matte anti-rust treatment. Stylish, durable, scratch-resistant oxford material outer layer. Comfortable lightweight mesh Lining with soft sponge padding in chest and belly. Adjustable straps allow a custom fit for your pooch. Ergonomic design ensures ease of use putting on and taking off Harness. Please measure for size. Measure your pooch's chest with a tape, at whatever point gives the widest circumference of front chest. Be sure to set aside 0.7-1.1 inches(2-3cm). Size SMALL: 12-17 inches(30-42cm); MEDIUM: 16-25 inches(40-62cm); LARGE: 21-37 inches(52-92cm).