Blueberry Pet Soft & Comfortable Summer Hope 3M Reflective No Pull Neoprene Padded Dog Harness, 4 Colors, Matching Collar Available Separately Chest Girth 18.5-20.8", Neck 17.5", Chest Strap 8-9.5", S/M; The chest strap is not adjustable. For a safe and fit purchase, be sure to check the neck and chest; A properly fitting collar and harness won't leave any room for your dog to chew. The harness does not stretch itself. NEVER leave your dog unattended with a harness on. The violet neoprene layer is added to match the fluorescent yellow webbing.To keep the style and high quality, our designer delicately embedded part of the neoprene harness with 3M reflective materials. The loop tied to the logo is specifically designed for the purpose of attaching dog charms, tags, pendants or accessories. Please do not attach any dog leash with this loop. This harness is a single product. Its matching collar (B00W522WZ2) sold separately All pictures are taken with our production samples from a size 17.5"(neck) * 20.5-24.5"(chest).