I really like this mattress. When it comes it's in a heavy long and narrow box. You open it and use the tool to cut the plastic from the mattress and it expands on its own. I had a box spring and placed it on top but within a week I purchased a metal foundation and placed this mattress on top. It continued to rise to its full 12" of incredible softness. It's really nice. But it needs to breath. Cannot be blocked by a box spring. It has great memory and springs for support. Great buy. My only wish was that it has just a little more isolation of movement you Do not roll or slide but movement is still felt. It's a Good mattress for the money. 🥰