Thinking in these terms will help you to understand the type of futon you may need. Hosting couples will require a full or queen mattress, while having a place for a friend to crash when they need to may only need a single. If you have the room, you may want to purchase a few different futons to allow for flexible options as the need arises. A futon may be listed in different ways, depending on the manufacturer or retailers preference.
Rigidity of a futon bed mattress is more important when the futon is being used mainly as a sofa. Flexibility basically defines how easy folding the futon mattress is going to be. If you are going to folding the mattress daily from sofa to bed back to sofa again, then buying a futon bed mattress with a lot of flexibility makes sense. Futon bed mattresses are made from a variety of materials.
When folded, the bi-fold futon bed mattress has a wider seating area than does the tri-fold futon bed mattress. The bi-fold futon looks much more like a traditional sofa, whereas the tri-fold futon looks more like a two seat sofa. If space is very limited you may want to consider buying a tri-fold futon bed mattress, but if not, the bi-fold futon bed mattress usually looks far more pleasing to the eye.
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