For some students sitting low to the ground is the most comfortable and effective learning environment. For many active children who have a difficult time sitting still, the movement the ball top provides can give them the input they crave, thereby Increasing concentration. The dome can also be used as a mini balance trainer and muscle strengthener. It can be used with the dome side up, or down. Rubber feet keep the seat stable. The robust dome can hold up to 400 lbs and features a matte-textured surface to ensure user safety. The product weighs less than 7 LBs, making it easy for children to move from place to place. Available in Blue or Purple.