Our 5/8" Non-Adjustable Biothane Collar is perfect for small to medium size dogs. The collar comes with a metal side release buckle. About Biothane Biothane is made in the USA. It is a poly-coated webbing that is 100% vegan and latex free and looks and feels similar to leather. It is durable, waterproof, stink-proof, and easy to clean and maintain. Just wipe off any dirt with a wet towel or hand wash with soap and water. Biothane has a break strength of 1000 lbs per inch of width. Sizing Please note that this collar is not adjustable. It is important to follow the sizing instructions below to ensure a good fit. Loosely measure the dog's neck where the collar would usually sit. Add 1-2 inches for comfort. Handmade with Love This product is made to order by hand. There may be slight imperfections and variations which add to the uniqueness of each item. If you have any questions or would like a custom size please email me at [email protected].