I may not be able to use it on our 4" box spring since the cover is 6-10" deep. The person on the phone said that it was a 6" depth. That would have been ok with a little hanging over hang but a 6" hang over is too much. I may have to return it. The service was excellent and delivery was two days early. Will use Wayfair in the future and I will make sure I will very detailed in the descriptions.