Crazy K Farms Kitty Holster Green Size M/L Size M/L - Collar Adjusts Approx 10"-13" / Girth Adjusts Approx 16"-20" Made of 100% washable cotton great for veterinary appointments / RV or Traveling D-Ring for Attaching to leash Sizing: XS - narrower and/or shorter-backed cats. It is 7 long, has a 3 wide girth less than 13". Collar Adjusts Approximately 5"-8" / Girth Adjust Approximately 10"-14" S/M - narrower and/or shorter-backed cats. It is 7 long, has a 3 wide girth strap and adjusts from approximately 14 to about 19. Collar Adjusts Approximately 9"-12" / Girth Adjust Approximately 13"-17" M/L - wider and/or longer-backed cats. It is 8 long, has a 4 wide girth strap and adjusts from approximately 16 to about 20. Collar Adjusts Approximately 10"-13" / Girth Adjust Approximately 16"-20" XL - wider and/or longer-backed cats. It is 8 long, has a 4 wide with girth greater than 20". Collar Adjusts Approximately 11"-15" / Girth Adjust Approximately 19"-23"