I use the mattress currently just on the floor with no frame and no box spring. It is still incredibly comfortable and easy to sleep on. I bought a Medium rated firmness, and in my opinion it maybe is closer to a firm, but that is possibly due to the no box spring. The material is very soft and it looks like the whole cover unzips so it can be washed. Heavy enough that it does not get pushed around on the floor during the day, but easily light enough for one person to carry and setup, etc. Do just be aware that once it shows up, unwrap it right away as it truly does take about 8-10 hours to fully expand.
this mattress was described as firm supportive base, it is not. When I lay on it I sink in almost to the ground. I weight 145lbs. There is nothing supportive about this mattress and IS NOT Firm. I have 2 other memory foam mattresses I got from O and they were rated as medium and they are much firmer than this on. I love them. I needed a smaller mattress for an antique bed or I would of ordered the same product. Buyer beware!