However, the rigidity is quite low. A futon mattress made from a mixture of cotton and foam is much lighter and less firm than that of one made from 100% cotton. The rigidity of a cotton and foam futon mattress is quite high, so is ideal for futons that are going to be used mainly as a sofa. A futon mattress made from cotton and polyester is also light and not too firm. Its rigidity is less than that of 100% cotton or cotton and foam mattress.
Secondly, it should be borne in mind that it isnt the futon frame that provides the comfort when either sitting or sleeping on a futon: it is the futon mattress that provides the comfort. A futon bed mattress made for a tri-fold futon frame is not as thick as that for a bi-fold futon bed frame. Therefore, if you intend to sleep on your futon regularly you might be best to buy a bi-fold futon bed mattress: a thicker mattress tends to provide more support.
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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