Size ChartSize Small: Neck girth 17-20in, chest girth: 20-24in; Leash length 5ftSize Medium: Neck girth 19-22in, chest girth: 22-25in; Leash length 5ftSize Large: Neck girth 24-29in, chest girth: 27-34in; Leash length 6ftSize XL: Neck girth 26-31in, chest girth: 31-39in; Leash length 5ftIt's recommended to measure your dog/cat carefully and refer to the size chart before order.FeaturesAir-mesh inside, lightweight and breathable fabric, your dog won't feel stuck in it when running or jumping.Metal D-rings, conveniently connect to the leash or handle, provides better control.Easy wearing, this dog harness is very easy to wear with velcro and quick-release buckle. The harness is tailored for your pet, ideal for daily walking, running, jogging, hiking, etcProduct Description