Large alloy base fitted with twin wheel hooded castors heavy duty gas seat height adjustment posture curved seat with waterfall front stylish mesh backrest with adjustable lumbar support adjustable headrest height adjustable arm rests push button synchronised mechanism with tension control adjustable for individual body weightmeasurementswidth 660mmdepth 690mmheight 1170 1280mmback width 490mmback height 595mmseat width 500mmseat depth 500mmseat height 480 570mm