This is a futon. Basically we recommend that if you re using a futon on a tri-fold frame, that you choose a flexible futon such as the Foam Core Deluxe. If you're choosing a futon just to sleep on, you probably would be best choosing a firmer futon such as the Foam Core Deluxe, the Firm, the Eco-Rest or the Green Dream.
Frames support the futon.
Bi-fold frames generally look like a chair or sofa when in its upright position, and a bed when in its open position. Tri-fold frames look more like a chaise lounge when in it s sitting position, such as the Forte or the Thrifty Sleeper. Bi-fold frames often come in various widths, for chair, loveseat, full or queen sofas. Choose the sizes to suit your needs. Then, choose a finish.