Making the choice to switch from my memory foam mattress to this one was difficult but I trusted the reviews and I'm glad I did! This mattress is incredible! At first when I touched it, I thought that it felt pretty firm for a medium, but when I laid on it for a while, it molded right around my body.  This mattress doesn't have springs if I understand correctly. It also has several layers of different types of memory foam. After 2 weeks, my sleep has improved and my pain has decreased. The only problem with that is I want to stay in bed longer and not get up! Beautiful and comfortable mattress. Very high quality.