Minimalistic yet high-quality aids for healthy, active sitting: Kristof Hock independently markets this globally popular design by reimagining the ordinary, largely burst-proof PVC air balloon in a stylish and homely way. Despite its cover, the inner PVC ball can be adjusted for seating firmness using a standard air pump by either deflating or inflating. A handy handle makes transportation easier, and an integrated bottom ring effectively prevents the ball from rolling away. Vluv Aqva Outdoor Sitting Ball. Equipped with water-repellent and UV-resistant acrylic fabric from Sunbrella™, this ball serves as a stool or pouf not only indoors but also on balconies and terraces for active sitting. The cover, secured with double stitching, can be removed via a zipper and washed at 60 °C.