【Adjustable】 This dog harness is suitable for various dog breeds. Size M: Neck circumference: 33-43.1CM (13-17 inches); Chest circumference: 43.1-63.5CM (17-25 inches). Both the neck and chest have adjustable straps, allowing you to freely adjust the fit according to your dog's size. 【Lockable Buckles】 It has one buckle on the neck and two buckles on the chest, for a total of three buckles, making it easy to put on and take off while avoiding the dog's neck. It also has a locking function; sliding the red button to "LOCK" prevents it from coming undone. 【Nighttime Reflectivity】 Made with 3M reflective material, this dog harness reflects light 360 degrees for safety. It's highly visible even on dark night walks, easily attracting attention from a distance, making nighttime walks more convenient. All parts that come into contact with the dog's body are made of soft mesh material, which won't hurt the dog's skin. 【Anti-Pull】 It has clips on both the front and back. The front clip restricts the dog's walking direction, providing an anti-pull effect (it's also possible to attach a clip-on dog tag). The connection points are reinforced with a multi-layer structure to ensure the dog doesn't break free.