However a futon bed mattress made from cotton and polyester is quite flexible. A futon mattress made from 100% polyester is by far the lightest of all; it also rates well for firmness and rigidity. A futon bed mattress made using inner springs is by far the heaviest and would only be used when the futon is almost always used as a bed. As you might expect, the rigidity of a futon mattress using inner springs is excellent.
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.
Early designs involved a steel tooth design that would fit into pocket welds on the arms. These would snap off over use. The alternative design was to run a bolt through the arms and into the rails. While better it still did not address the issue of bending stretcher rails. Bent hinges also added another issue that would happen from use over time. While not as common as the other problems this issue still led to the failure of many black metal frames.
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