Size S: The size S cat harness adapts to the neck circumference of your little one (neck circumference: 11 inches - 13.7 inches, Bust: 18 inches - 20 inches) Before purchasing, we suggest that you measure your cat or puppy's neck and chest. WALK WITH YOUR CAT: Includes a leash and harness, this cat carrier is perfect for cats and small dogs. Comes with clip and leash, perfect for your cat's walks on the grass. Easy to put on and take off: This cat crate with quick release buckle ensures easy on and off. easy removal. Just slip her head over and tuck the sides behind her legs. Safety Vest: Cat harness reflective strips make your cat visible in the dark, perfect for walking at night, dawn, dusk, night or on foggy and rainy days. ADJUSTABLE VEST: The adjustable chest and neck straps of the Adjustable Kitten Harness are perfect for your furry friend. No more problems with your growing dog.