Concept Plus Blue Fabric Operator Office Chair. Deep cushioned seat and back upholstered in a tough wearing fabric. 1-dimensional adjustable arms included as standard. Inflatable lumbar pump for extra support. Adjustable ratchet back and seat slide. FR: Med. Fabric: 100% Man-made. Mechanism: Asynchronous movements / torsion / seat slide /ratchet back / lumbar. Arms: 1D adjustable.