New backrest concept with unique freedom of movement. High, contour-shaped backrest with spine shaping and lumbar support, waisted backrest shape for maximum arm freedom, height adjustable via raster mechanics. Includes wing armrest "Q3(B)". Special intervertebral disc seat for optimum support in the pelvic area. Permanent contact mechanism for adjusting the backrest angle, polyamide base in black, equipped with load-dependent braked safety double castors for carpeted floors. This model bears the GS mark of the LGA Nuremberg and fulfills all safety-relevant requirements.