Adjustable Size Small: Neck girth 11", Chest girth 12" - 16", leash length 4.9 ft. Can fit most of small and medium dogs, but please refer to this size and measure carefully your before purchase to find the best fit.Comfortable paded dog vest harness Made with High quality polyester material with adjustable design will be the basic for your lovely pets to traveling, hiking and daily walking.Breathable mesh linning suits any wheather.mesh design ensures breathable and lightweight during running. No matter hot summer, or chilly winter, or just warm spring and cool autumn. Beauty will be with your baby pets.Easy Control: The adjustable strap can fit the kitten and puppy's body more. Quick-release buckle and nylon strap make it easy to put on and take off and dogs wouldn't escape, durable D-ring is for leashes or handles, provides safe and easy control while out on walks.Suitable Size - Please measure your pet size accurately before placing an order If your pets chest grith is between the two sizes, it is recommended that you can choose the larger size and adjust the strap to prevent the harness from being too small.