Key Features :
i : Allows children who have trouble sitting still to quietly move while working enabling them to stay on task and be more productiveii : Unique antimicrobial material offers a proven barrier against multiple dangerous pathogens including E. Coli, Staphylococcus and many other bacteria, fungi and moldiii : Flexible nubs on one side and smaller bumps on the other give a choice for just the right amount of tactile stimulation to calm kidsiv : Ergonomic disc causes the body to stabilize itself – improving posturev : Firmness can be customized with the easy-inflation pump (included) to contour exactly to each child's needsvi : 13"/33cm diameter is a great fit for a kid's seating while being large enough to grow as the child does