We kept our old futon sofa frame and this new futon mattress from Cambridge Futons has transformed it from quite an uncomfortable sofa (the original futon mattress was a cheap one bought from a different company and had become quite uncomfortable as it became worn and part of the metal frame would dig into our legs!) to a sofa of luxury. Everytime we walk into the living room we are reminded that sitting down is now something to look forward to. We have tried it out as a bed and it is outstandingly comfortable. Very happy with the quality of our new futon mattress.