It was soon discovered though that these frames were not such a bargain that they appeared to be. The first problem with black metal frames is the round metal bars that make up the seat and back sections of these frames. Where as wood futon frames are using flat slats, black metal frames have hollow round bars. Thinner mattresses would slide through the gaps between the round bars. On wood futons this was never a problem.
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.
But if space is at a premium and you will only occasionally sleep on your futon best, than the tri-fold will certainly suffice. The best futon bed mattress is the one that best suits your requirements. Consider the space you have available, and what will be the main function of the futon bed mattress. If the futon is going to be used regularly for sleeping on, then most consumer reviews of futon beds tend to favour the bi-fold futon frame and mattress.
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