I am bought two mattresses in November for my mom and I. Both mattresses at that time were firm. About a month later I returned mines because it was still really hard and made my whole body hurt. I would get up in the morning and my whole body would be hurting. I have an adjustable base but it didn't matter if I was laying flat out elevated. I got the medium which is OK but I still get up in the morning with back aches. I purchased this bed because it was said to be top of the line, would conform to your body and help to relief body aches this is not the case. I am not satisfied with this product because it did not live up to the hype, and especially the price that I paid for it.