I had gotten a foam mattress a few years ago and the firmness just didn’t last. My back began to hurt. I was very excited to try out this Serta mattress and it has been a life changer. My low back no longer hurts and it’s only been a week!. It’s so comfortable and soft, but just the right amount of firmness. I don’t sweat at night like I use to with the foam mattress either. The breathable cooling fabric makes it easier to sleep all night long without having to kick the covers off.