The Superior Orthopedic Indoor/Outdoor Bed has a water-resistant cover than can be used in or outdoors. This bed contains double the density of our basic foam beds for superior comfort and durability. The polyester cover has a vinyl backing to protect from elements and occasional accidents. Its a truly superior and firmer mattress pet bed that supports joints, bones and keeps pets off the hard floor. Great for all pets that deserve and need a little extra stability when getting on and off a pet bed.