Our 4Knines Extra Large Dog Bed Liner is made of durable waterproof material that will keep the interior of your pets bed clean and dry. It will keep the bed from developing mold, mildew or other odors while protecting against dust mites and other allergens. The soft, quiet fabric is specially designed so you do not hear the bed every time the dog moves around. Easy installation with the side zipper opening, allowing you to place the bed inside. This liner is machine washable and air dries. The Extra Large Dog Bed Liner measures 54 inches by 36 inches. Our dog bed liners are backed by a 2 Year Warranty. We at 4Knines have developed innovative products to look great and last! We also believe in giving back. For every product sold $1 is donated to the ASPCA and other accredited pet protection and rescue groups. Nothing But The Best For Your Best Friend!