Natural fibers, cotton and linen are nice and soft to begin with, but can wear faster than synthetics. Synthetic fibers; polyester, nylon, rayon and such; might not be quite as soft but they last longer than natural fibers. Synthetic fibers have come a long way, they are constantly being improved and they hold vivid dyes that cotton and linen cant. A good compromise between Natural and Synthetic fibers is blends of the two, which are in abundance in the futon cover market.
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.
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.
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