This step-in harness is designed for a low profile, comfortable, safe, and easy fit. It features 5 reflection points to increase morning or nighttime visibility while on walks or runs. Designed with 4 points of adjustability, it is ideal for dogs of all sizes, body types, and breeds. These versatile vests fit dogs from 4lbs to 70lbs. Each harness comes on a hanger which includes a sizing chart. Our Scout LoPro Harness comes in 5 different sizes: XS (4-8lbs/12-14in girth), S (8-14lb/14-17in girth), M (14-22lb/17-22in girth), L (22-40lb/21-26in girth), and XL (40-70lb/25-31in girth). This padded chest, breathable mesh, no-pull harness helps train dogs to walk nicely by putting leverage on their chest instead of the neck.