The Collar For The Adventurous Design named for and designed by our Instagram Ambassador, @mountainodyssey Our Biothane® collars are waterproof, stink-proof, highly-durable, and feature vibrant color combinations! Best of all, a quick rinse under water is all it takes to get your collar looking new again. If you have a dog that loves getting dirty, this is made for you! Collar Sizing Guide: Small: 8-12 inches Medium: 11-16 inches Large: 15-20 inches XL: 20-24 inches Please be sure to double check your pup's collar size! Ensuring size is the responsibility of the buyer and we do not accept returns or exchanges on products where the wrong size is selected. It's always best to measure twice just to be sure! NOTE: The appearance of the Small size differs slightly due to a different construction method needed to accommodate both colors of webbing. Small uses 3/4 inch webbing, while all other sizes use 1 inch webbing.