The other issue with the hollow bars is that if enough weight was placed on a spot they would begin to bend. The issue became so bad that a 90 day warranty was put in place by most manufacturers of these frames. Another issue the black metal frames suffered from were bending stretcher bars or rails. Again the hollow nature of these strecther rails presented issues with breakage and bending.
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.
The flexibility of an inner spring futon mattress is quite poor, but you would only really buy this type of mattress if the futon is going to be used as a bed most of the time. Futon beds are a popular choice for many consumers due to their flexibility of function. Before buying a top rated futon bed mattress make sure that the qualities - mentioned above - of the mattress are what you require. If you know exactly what you want before you buy you are going to avoid being disappointed with the purchase of your futon bed.
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