The Humanscale Liberty Office Chair has a tri panel, non stretch construction that senses your form, creating body fitting contours with appropriate lumbar support. The stretch provided by the mesh back of Humanscale Liberty Chair adjusts to your body for ultimate comfort. Plus, the Liberty office chair has only 2 manual controls. It makes the other adjustments itself so that you don t have to. Humanscale Liberty Office Chairs patented, intelligent counter balance mechanism automatically provide