We purchased a Classics Brand mattress before from Wayfair, and that bed expanded without any problem. This king size mattress has been attempting to expand for three days, and the edges are still squished. It is expanding very unevenly. One side is finally at 9 inches; the rest are still less than 9 inches, and the edges on the top and bottom of the mattress look hopeless.  We put a heater in the room, and that has not helped either. There is also a cut in the foam on one side.