Memory foam top, indoor/outdoor fabric and a snuggly-soft removable top panel - the Furhaven Deluxe Memory Foam Mat Convertible Sherpa Panel Water-Resistant Outdoor Traditional Foam Mattress Pet Dog Bed has it all! The bed base is manufactured of coated polycanvas fabric to help protect foam filling moisture. A snuggly-soft faux sheepskin (sherpa) top panel zips on and off as needed and acts a pocket for cooling or heating pads. Don't need the top panel or just want to wash up quickly? Simply unzip to remove! The medical-grade foam core is topped with a layer of memory foam to conform to your pet's shape and weight. This provides superior orthopedic support of joints and pressure points for a deeper, more restorative sleep. Step-on design for easy access by older or disabled pets. This pet bed is ideal for bigger dogs (or small dogs who like to share!).