Homework, drawing, eating and playing; video/board games are no longer sedentary activities. Colorful choices make it a good fit for any child's room. Kids can't tip over. Ideal for children with ADD or ADHD; provides and outlet for restlessness and extra energy. Gently rounded ergonomic base allows you to move and flex without leaving your seat. Provides both stability and flexibility. Exercises back, leg and abdominal area. Relieves sore muscles and stiff joints. Allows a wide range of movement at desk or work areas. For boys and girls ages 4 to 12. Base diameter measures 13.75" , seat diameter measures 11" , and chair height measures 14" .