ehomegoods 54X37 X4 Sudan Brown XL Orthopedic Memory Foam Pet Pad Bed Mattress for Large dog with 2 external covers + Waterproof Internal cover The listing comes with 1 memory foam insert at 54"X37"X4" size with waterproof internal cover + 2 external cover in Sudan brown color. The 2 external covers can replace each other while one is in the washer for cleaning. Great for pets of all ages especially with achy joints, arthritis, hip dysplasia and/or muscle problems. 2 External covers : Coral Fleece external zipper cover in Sudan Brown color on top and Microfiber suede fabric in coffee brown color at bottom side ( 58"X41" flat cover size ). The memory foam is secured by Waterproof internal zipper cover. Machines Washable external covers. We offer 100% luxurious 3 pound density solid piece memory foam. Unlike other multi-layered partial memory foam pads that cut corners and cost, our solid memory foam are superior in build and structures. Memory foams are well known for its ability to contour to the body with great accuracy during resting state; for maximum comfort and orthopedic support. Shape will always stay true to its size and will not flatten over time at 4" thickness. Naturally antimicrobial and resistant to mold, bacteria and dust mites. We use the similar memory foam which is sold at high end therapeutic mattress store to promote better sleep, healthy joints and long lasting.