Their suitable cat bust sizes are - L: 40-44cm (10-14g). In order for your cat to have a comfortable travel experience, please measure your cat's bust before purchasingAutomatic Telescopic Traction RopeThe 1.2m length automatic retractable traction rope is made of nylon tape sturdy, durable rust-proof swivel hook and scratch-resistant material housing. You can use the thumb button to quickly lock, pause and unlock buttons. Premium coil spring provides everlasting retraction, great for walking, jogging, running or hikingNight ReflectorThe harness is equipped with night reflective strips to make cats or small animals easier to spot the night. You don't have to worry that your cat can't find the night.Escape ProofThe cat has a wrap-around design on the chest and back, with an explosion-proof buckle. It can effectively prevent the cat from detaching from the strap, which is safe and comfortable. Adjustable There is a 1.5 inch distance between each of the same strap sizes, which can be adjusted for the bust. The Soft Mesh Puppy Harness is designed to fit the curve of the cat's body. Soft sandwich mesh fabric with smooth edges reduces friction and pulling on dog's paws and neck, allowing your cats and dogs to travel comfortably with their owners.