This specially designed wiggle seat helps kids stay calm and focused. It allows children to quietly move while working, enabling them to focus, stay on task and be more productive while sitting in the classroom, at meals, and around the house. Features flexible nubs on one side and small bumps on the other that give a choice for just the right amount of tactile stimulation. This ergonomic disc causes the body to stabilize itself improving posture and is a portable alternative to balance balls--with the same benefits. Includes an easy-inflation pump that allows firmness to be customized to contour exactly to each child's needs. The 33 cm (131") diameter is a great fit for a kid's seating (while being large enough to grow as the child does!) and is effective on chairs, benches, or directly on floors.