Durably made with comfort and function in mind, our high quality, full grain Italian leather ID collars feature: soft, supple leather for a comfortable fit strong, wear resistant, polished stainless steel buckle style closure strong, wear resistant, polished stainless steel D-ring for attaching tags and leash this natural leather product will show some variation in color and will develop a patina over its lifetime LEATHER COLLAR SIZES & FIT 5 collar size options: 14", 16”, 18”, 20”, and 22” inches leather collars are 1” inch wide collars feature 4 sizing holes for a flexible, comfort fit collar fit: The lengths of our leather collars are determined by the measurement from the middle of the metal buckle to the first hole - which is the smallest size the collar will adjust to. That means the smallest hole will fit your dog’s neck snugly and that the other holes on the collar will allow for a wider, comfort fit on your dog. To determine the correct collar size for your dog, use a soft tape measure or piece of string and wrap it snugly around the base of your dog’s neck – snug enough so that you cannot fit any fingers under the measuring tape. Round down to the nearest even number. For instance, if your dog’s neck measures 17” inches you would order a 16” collar. refer to the product image “Leather Sizing Guide” on the product page for further sizing reference English alphabet characters only.