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.
You may see the dimensions listed as 60x84. These dimensions include the armrests, which serve as the head and footboards of the futon when it is open as a bed. In this description, the armrests are each 2 wide, so you know the total amount of space you will need for the futon. A full sofa has futon dimensions of 54x75. They may be listed as a full sofa, lounger, or click clack bed.
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.
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