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Futon Mattress Double A futon mattress double is a type of mattress that can serve as both sleeping space and sofa cushions. They are available in various sizes like twin, full queen and King. These beds are more firm sleeping surface that can help ease back pain. This is especially beneficial for pregnant women who are struggling with back pain. Firmness A futon mattress double is a thin mattress that doubles as sofa. Futon mattresses usually come with a polyester or cotton cover and a filling tha