When this first arrived I was ready to call and ask for a return. The bottom of the cover looks very cheaply made, it is a sheer kind of mesh. The top is a strong sort of nylon. For some reason though it is the first bed, out of five, including an Orvis Tough Chew that my puppy destroyed in five minutes, that she has not completely wrecked. She loves it and it is completely fine almost a month later.