KOPEKS 4'' Orthopedic Memory Foam Dog Bed - Large with Removable Cover and Included Removable Waterproof Inner Protector - Dark Chocolate Color Great for pets with arthritis or joint and muscle problems Made out of 100% memory foam. Removable and washable cover. Waterproof removable inner cover is also included. Size: 35-Inches x 28-Inches x 4-Inches thick Memory Foam. Water resistant, heavy -duty. KOPEKS is a registered trademark and best-seller of Pet Accessories.