Terrain D.O.G. Reflective Neoprene Lined Dog Harness Comfortable neoprene lining Four slides for adjustability Reflective safety stripe Measure around the dogs body (behind the front legs) for the proper girth size Small: 13-20 inches, 3/4-inch width Medium: 16-25 inches, 1-inch width Large: 20-33 inches, 1-inch width