The Wiggle Cushion is a perfect solution for children who have a tough time sitting still. The Wiggle Cushion is a cross between a ball chair and a seat cushion. You can inflate the Wiggle Cushion to the max to stimulate balance and core work, or deflate to use as a seat cushion which encourages movement. One side of the cushion is a smooth surface, the other side has slightly raised " bumps." You can choose between receiving tactile input or sitting on a smooth surface.