The SuperSoft Ultra Dog Bed is filled with Hypro-Loftâ ¢, an exclusive blend of virgin and recycled fibers, which provides unequalled loft retension. The liner will not shift or mat allowing to stay true to form even after washings. Completly machine washable, the ultra bed has a sherpa top and cotton or nylon bottom which removes for easy cleaning. Super Soft Ultra Dog Bed Sizes: Medium: 25 x 33 inches Large: 30 x 40 inches X-Large: 36 x 48 inches Poly-Suede is quality brushed microsuede fabric, heavy duty 12 oz. 100% polyester with added backing for strength and durability, washable and easy care, comfort at its finest, add a touch of luxury with this top-rated microsuede in a collection of colors to match any home decor.