Four Paws Magic Coat Mattress have special fibers that will help make your dog's coat shine.This dog bed is also approved by Veternarians to help dogs with arthritis problems. The mattress is constructed of luxuriously soft, yet supportive, foam on the inside. The outer lining of the mattress is fashioned of plush, dense fibers that provide comfort for your pet. Excellent for use in carriers and crates. Machine washable. Four Sizes - choose below: