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.
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.
Buying a futon bed is a great choice. A futon bed can be used during the day as a sofa and makes a great bed for sleeping on. However, before buying you should know what futon bed mattress qualities to look for. It isnt the frame of a futon bed than provides the comfort; its the futon bed mattress. If you havent yet bought your futon bed you should be aware that futon beds come in two forms; bi-fold and tri-fold.
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