Topstar SITNESS HIGH BOB Ergonomic Office Stool, Fabric BlackORIGINAL SWISS PATENT WALSER "Sitting in motion" by the Swiss designer Thomas Walser is re interpreted. Even its predecessor, which was equipped with a pneumatic tyre, was a global success. The new SITNESS BOB has the open design of a ring. Based on a spring effect, it swings freely and always returns to its starting position. The result is safe sitting comfort, yet with complete movement, it's maintenance free and, as the high version, perfectly