This is a firm mattress. It comes compressed in a box for easy transportation, great for two people to lug up stairs. Once unboxed it comes with a cutter to open the vacuum seal and it takes 48 hours to fully expand. I found it to be quite firm and the pillow top doesn’t provide much cushion, but that’s what I enjoy. There is very little movement transfer. Mine did not expand to the full 12 inches, it is a bit over 11. Overall I’m very happy with the product and seems like a good firm mattress. For size reference, I ordered a full.