Look for foam that has a density no less than 1.2 pound per cubic foot. With foam, higher density usually equals a long lasting mattress that retains it feel. Natural fibers, mostly cotton, are good for futons that need more flexibility. For those of us that are traditionalists a natural fiber and foam blend is a good choice when looking at a futon mattress. The futon cover is the piece that buttons up the look of the futon.
The hinges were attached to the arms of the futon frames with two bolts and two nuts. While this design was OK the hinges themselves would fail when too much weight was applied to one side or the other. These would also bend out rendering them useless in the operation of the futon. Most specialty futon retailers pay little to no attention to black metal futon frames. Retailers Ive spoken to have said that the black metal futon frame is the number one service headache when it came to futons with over 95% of service issues being the failure of a black metal frame component.
Finally, always buy the best you can afford. There are many top rated futon bed mattresses to choose from. You can find them in many department stores these days, or you can find many makes and models of futon beds on the internet. Remember, know exactly what type of futon bed mattress you require before you go out and buy one. When the futon industry was born back in the 1980s, the frames were well thought out and well constructed.
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