There are a few different configurations for a futon, and the three most common frame types are bifold, loveseat, and trifold. Bifold futons are the most popular frames. These frames simply fold in half longways to make a sofa and stretch out flat to make a queen or full size bed. Trifold futons fold the mattress into thirds rather than in half, giving the couch a nice footrest when it’s in the folded position. Loveseat futons can fold like a bifold or a trifold, but they use a two-piece mattress and make a loveseat or armchair when folded and a twin size bed when unfolded. One thing to keep in mind with trifold futons is you’ll need to use a thinner mattress with them to accommodate the way they fold.