Mattress is firm and I'm not sinking into it. I loved the size it comes greatly packaged the box was kinda destroyed but it was packaged inside very well in those vacuumed bags and the seal on those was very tough. Either way box got torn a bit but mattress was still packaged in perfectly fine and no moisture would get through. To me it might not me as firm as normal people I like it ground firm mostly lol but however this is much firmer than my previous mattress. I AM NOT SINKING IN. Very comfortable. We had a very soft mattress so this is a big difference for me. Which I love. The mattress is quality and big as pictures. I am beyond happy with my purchase.