I've had this "mattress" for about a month now and it's very firm and unsupportive. I use the term mattress loosely because it feels more like a mattress topper. This is a product made for Serta, not by Serta. There's about 3 inches of memory foam glued to the top of 5 inches of regular foam and then covered. If I had to do it all over again I would have simply buy a memory foam mattress topper for my old mattress. You get what you pay for.