Futon mattresses today are thickly stuffed with cotton, foam, polyester, latex, wool and coils. All futon mattresses are tufted by hand or machine to hold all the layers together. Different fillings define the weight, firmness, rigidity, and flexibility of futons. Foam and wool stuffing gives futons a rigid shape. Firm futons work well as a couch or bed. Polyester futons more flexible and verry comfortable for everyday seating. Futons are available in twin, full, queen and eastern king sizes.