When first received was excited about the pet bed however within 20 minutes of use the zipper holding the top cover separated from the rest of the mat and continues to do so. A stronger metal zipper instead of the thin nylon zipper would work better.  On day 2, the seam on one side of the mat has a small separation. The bed was purchased because it was thought to be durable, however that does not appear to be the case. The bed in general is a good bed, just disappointed in workmanship and I do not think that it is going to last very long.