This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
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n. A thin mattress of tufted cotton batting or similar material, placed on a floor or on a raised, foldable frame.

n. A thin mattress of tufted cotton or similar material, placed on a floor or on a raised, foldable frame as a bed.

n. A round cushion used for Zen meditation (traditionally made of woven bulrush leaves)

n. mattress consisting of a pad of cotton batting that is used for sleeping on the floor or on a raised frame

"Almost everyone has a horror story from a sleepless night on a paper thin mattress, and just hearing the word futon is enough to make..."

mattress   

too-soft    over-stuffed    pull-out    king-size    drop cloth    well-sprung    plastic-covered    silk-covered    velvet-covered    comfy