We were very surprised when this king-sized mattress arrived in such a small box. We opened it up immediately, and within a few hours it had expanded into shape. There were a few places along the edges that looked misshapen though, and we were concerned. We waited the 48 hours as recommended, and it completely straightened out! It looked terrific! We actually purchased this item to cut into cushions for our smalll RV which will reassemble into a king-size bed at night. I am not quite finished covering all the cushions, so I cannot honestly evaluate the comfort at this point. I can honestly say that I am very pleased with how it feels when we just lay down on it. We have a memory foam mattress on our home bed (I have back trouble), and I felt this would be a good choice for travel. I am looking forward to using it!