i didnt see the mattresses arriving as I was still at work - i was told that they were flat packed and very thin and in a went to full size within 2 hours for the mattresses to full expand its foam. recommended is around 72 hours but I wanted to to fully use the mattress potential. I ordered 3 in total, and was also surprised at the size of the mattress depth as this was thicker than the last mattress by around 3 inches .
it would be good if the old mattresses were taken away while the new ones were delivered as this would have saved  time to replace them. I am extremely happy with the amount paid, and they are worth every bit.  Even tested a glass of water at one end of the mattress while i slept in it at the same time, the glass didn't spill any of the water amazing price, amazing technology and i have had one of the best sleeps ever , thanks wayfair!