Firm yet comfortable. I suffer from chronic back pain so I alternate between this and the floor. I added a nice mattress topper and I can tell the difference in comfort because my sleep is prolonged on days that I don't need to get up early. For some reason I feel like I'm dreaming more as well. I think this part is also attributed to the overall comfort of the mattress  as well. I did a great deal of research. Overall, as a consumer we all need to do our homework with what works best for us.