? TIPS: Please check our size chart before purchasing and select the correct size to accurately measure the pet's chest size to find the most suitable size. The size does not match the size you purchased before, and the measurement of the pet's chest using the human waist measurement method.) Bust size: XX small: 8" - 9.2", Leash size: about 63" long, 0.7" wide. Bust size: X-Small: 10" - 11.3", Leash size: about 63" long, 0.7" wide. Bust size: Small: 11.6" - 12.7", Leash size: about 63" long, 0.7" wide. Bust size: Medium: 13" - 14.3", Leash size: about 63" long, 0.7" wide. Bust size: Large: 14.6" - 16.3", Leash size: about 63" long, 0.7" wide. Bust size: X-Large: 16.6" - 18.3", Leash size: about 63" long, 0.7" wide. Bust size: XX-Large: 18.6" - 21", Leash size: about 63" long, 0.7" wide. Feature a 360° omnidirectional 3M reflective strip for better light reflection in low light conditions. Enhances safety during night walks. (Neck of the harness has no other weight bearing.) Adjusting the harness requires multiple adjustments to the slider and velcro adhesive Block to make it more comfortable to wear. (Balance of the adjustable shoulder strap must be adjusted to maintain the balance of harness traction.) Heightening and Extended version of the Velcro adhesive block and adjustable slide block,portable adjustment size to make the cat difficult to escape. Squeeze harness closure button clasp, making the harness not easy to Open, and is equipped with a double belt buckle that can be used to hang the pet leash. Most children need to spend some time getting used to it, or to bribe Children with snacks, making them more and more accustomed to wearing harnesses. (Kitten is an escape expert.You need to be indoors first, patiently guiding the children to get used to wearing the harness, and then go out when they are used to wearing it.