This is a long-selling balance chair that can be used by both children and adults. Positive Body Response Variable Balance encourages movement and increases responsiveness to individual movements. Relationship and reaction between body and chair in a continuous motion creates energy and vitality to the body and mind. The "Variable" chair was first designed as a balance chair, is a monopod that is the origin of the Balance series. It is still at the same time with a novelty, unlikely to be designed about 30 years ago. Versatile and light enough to be carried with one hand, the Variable chair is designed to meet the demands of todays diverse lifestyle. Time will be too much in the morning while working at your desk with the concentration and creativity that natural upright posture brings to you. It is also a great learning chair in the nursery to encourage good posture and deep breathing, increase thinking and improve home learning ability. In addition, the variable also helps to stretch your back muscles and strengthen your abs while working. Backrest - sold separately Delivery time 5 months (backrest + cushion) Standard: ¥33,480 (tax included) We cannot order the back rest at this time.