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Futon Mattress Double A futon double mattress is a type that can be used both as a sleeping space and as a sofa cushion. They are usually available in sizes such as twin full, queen, and the king. These beds have a more firm surface which can help to ease back pain. This is especially beneficial for women who are pregnant and suffer from back pain. Firmness A futon mattress double is a thin bed that doubles as sofa. Futon mattresses typically come with a polyester or cotton cover and a filling fle