I purchased this matress after days  hrs of searching different thickness  styles. Hard to decide which is best wout lying on them. Anyway I picked the 10 medfirm for a daybed that I also purchased from wafair. Its more soft than firm l should of gotten firm I have a bad lower back so I feel it sinks on that area other than that the bed is comfy.Sitting at the edge is not firm  im only 51  125 lbs. I mean you wont roll off while sleeping but if your gonna sit on it dont sit in the middle and wear it out go to the of the bed so your
 matress last longer.