Due to the increase in inattention in class by hyperactive children it would be useful to introduce special chairs in order to give them a way to maintain concentration easily. Hyperactive stool is an unstable seat designed for overactive children, who suffering from autism, between 4 and 10 years old. The user has the possibility to move freely. The blue color has been chosen to coat the seat, which conveys a sense of calm and well-being to the mind, helping memory and concentration. Lastly has been applied a silicone texture with an anti-stress function.