Sitting on the Aeris Swopper has many advantages compared to the exercise ball: First, the Aeris Swopper offers more safety: it doesn't roll away, it can't burst, you can't fall over or off. Also, with the Aeris Swopper you can adjust three features quickly and individually: Seat height, spring tension, and lateral movement. Aeris Swopper has a comfortable seat. The seat is not cold, not slippery, does not collect dust and does not have a bad scent. While an exercise ball is made of PVC the Aeris Swopper is made of high-quality materials, Made in Germany. The Aeris Swopper has a timeless, innovative and original design that was awarded with several international prizes and easily fits into many interiors.