eConsumersUSA 55''x37''x4'' Solid High Density Orthopedic Memory Foam Waterproof Pad Pet Dog Bed Crate with External Washable Chocolate Brown Microfiber Suede Anti Slip Cover FREE 2nd External Cover True Memory Foam Pad in size 55''x37''x4'' . 100% Solid Piece 3 pounds density. Resistant to bacteria, mold, and dust mites; naturally antimicrobial. Hypoallergenic Internal Cover: Brown Taffeta Full Waterproof Fabric. External Cover: Washable Microfiber Suede Chocolate Brown with Black Bottom Anti Slip Dots Gusset Cover. Special Eyelid design to protect the zipper. FREE BONUS 2nd External Cover - will come in handy when you want to replace them for washing or cleaning. Our Orthopedic Therapeutic memory foam will ease your pets aches and pains, muscle pain and relieves joints. Also a great solution for pets whose have muscle stiffness, dysplasia, and arthritis. Shape will not deform or change in sizes over time. Will not flatten over time and usage.