Futons can be broken down into two categories: Bi-fold futons and Futon loungers. Bi-fold frames have 2 body parts, the sitting part and the backrest part. Futon lounger frames are also known as loveseats or space savers because they have an additional leg part (lounge extension) that folds into the frame and hides between the futon base and the seat deck. Also available An Innovative Wall Hugging Frame Design. These are particularly versatile as they can be opened and closed without moving the sofa bed away from the wall, hence the name wall hugger.