Topstar SITNESS CUBE Swivel Visitor Meeting Chair with armrests, Fabric AnthraziteTopstar is one of the most modern manufacturing companies for attractive office chairs. With their Sitness series they are also the pioneers in the field of fitness office chairs with three dimensional movable seats. This chairs get you moving even when you are seating. With the use of the three dimensionally flexible Sitness technology, Topstar ensures minimal movement of the seat surface, which means that the spine and back always remain dynamic.