When I received the item, I was a little skeptical about the queen size mattress in a small box.  I called the Wayfair helpdesk and was told it's machine compressed and will expand to 13" height.    After I opened it up, it expanded.  After about an hour, it fully expanded including the pillow top.  This mattress is soft and comfortable then my store bought.  Planning to buy another one again.  Recommend to buy it.