Authentic Puppia Soft Dog Harness made out of 100% Polyester Adjustable chest belt and quick-release buckle Comfortable padded neck opening Machine washable, but hand washing and air drying are recommended Medium - 15" x 20.5" Chest Girth / 13" Neck Girth To find out if the harness fits comfortably for your dog, place two fingers under the harness at the neck and chest. If two fingers can fit, the harness is correctly adjusted. If two fingers can not fit and is too tight, please loosen the straps or opt for a larger size. If there is too much space, please adjust to tighten or opt for a smaller size.If by chance your pet tries to slide back out of the harness, please do not pull the leash Simplicity meets functionality in our Yellow Basic Soft Harness by Puppia. Breathable 100% soft polyester mesh. Comfortable neck. Adjustable chest belt with plastic clasp. This bright yellow mesh dog harness is great for warmer months and dogs that don't pull on leash too much. Comfortable and safe for your precious puppy. Matching dog leash sold separately.