DESC: Nature's Foundation pet beds were developed with your pet in mind. Just as you would purchase a bed mattress with a support system for yourself, so you should consider a bed with a support system for your pet. The unique design of this bed incorporates 2 3/4" of orthopedic foam on top of 2" of cedar bedding which is enclosed in its own zipper bag that can be refilled and washed. The combination of the foam and cedar gives unparalleled support and comfort. Other features include a washable cover that's nylon on one side, fleece on the other and a carry handle for portability. Orthopedic Pet Bed Size Info Small - Measures 26.5" x 18" and comes in Red. Medium - Measures 36" x 24" and comes in Blue. Large - Measures 42" x 28" and comes in Green.