A Wagner office chair is characterised by the worldwide patented Dondola® seat joint in the heart of the chair - namely at the point between the seat shell and the chair base. The connection between these two parts of the chair is usually quite rigid. The seat joint starts exactly there and disengages it. This is why a Wagner office chair can follow your natural movements while sitting in all directions. Often these sitting movements are quite small - nevertheless they lead to a permanent tensioning and relaxation of your back muscles, which in turn permanently relieves and strengthens your back.