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.
Futon frames and mattresses can go just about anywhere, I havent seen a space that they dont accommodate. Ive seen the frames I sell go into third story rooms in those gorgeous 1800s New England Colonials. While they are beautiful homes, they are quite a chore to move anything into or out of. I have sold many Futon Frames and Mattresses to customers in New York City, where space is at such a premium, that Ive lost count.
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.
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