I bought two of these mattresses for our new home. WOW, are the ever comfortable! We've all been sleeping straight through the night on them. When they arrive, plan on at least a couple of days for them to fully extend and get the chemical smell out of them. We put them in a room, closed the door, cracked some windows, put a fan on them to blow the odor out the windows. It's pretty intense. However, it is worth it. They do not need anything but slats under them: no box spring. On an older bed, I bought some additional pine boards and had them cut at the home store to match the ones already on my bed. By doing this, I was able to lower the height of the bed so a person with a handicap can easily get into the lowered bed. The mattresses are a wonderful product and I highly recommend them.