Ringo has focused on an adjustable backrest so that children can keep a proper sitting posture. The chair allows the user to adjust not only the backrest height and seat depth but also the armrest height at once by simply moving the armrests. Ringo is designed based on the body dimensions of children aged between seven and twelve years old. In addition, the back and seat pads of Ringo are easily replaceable for laundry and colour exchange.