Japanese floor mattress The futon, Japanese traditional style bedding, is a type of Japanese mattress used on the floor at night for sleeping. This Japanese bed is traditionally rolled up during the day when not needed to free up some space in the room. Fabric: 100% Polyester / Stuffing: 100% Polyester and Polyurethane. When it comes to futon, Japanese style futon are the most popular Japanese bed. Originating in Japan, this soft, rollable Japanese mattress can easily set up on the tatami mats on the floor to provide an airy yet firm support. 3-Layer Futon Mattress These three-layer futons disperse pressure on the body making for comfortable sleep even if have back pain.