Arrived as specified in a roll in a box. It was about 2 " thick rolled out, before to cut the plastic, then it gets 5x bigger in about 15 seconds. Then it needs to sit for two days for the springs to fully expand, and the chemicals to air out. I bought it because another review said it was a little firmer than most medium mattresses. It has lumbar support, which I need. My last mattress was killing my back. I was looking for one a little firmer, but they were sold out or more expensive, so I am happy with it. Fairly pleased with the ease of delivery and price.