Twin Size Traditional Japanese Floor Futon Mattresses, Tatami Foldable Cushion Mats, Yoga, Meditaion 39" Wide X 80" Long (Royal) Brand new floor futon mattress, made in USA. Twin Size Bed sized 3" thick x 39" wide x 80" long. Filled with white cotton battings, two fiber layers and a layer of foam. Cover material is made of 100% polyester. Color: Solid Colors.