Physio approved leather faced operator chair designed for 24 hour usage Extra high ratchet back offers permanent thoracic contact Sculpted back helps to promote good posture Thick, luxurious seat pad, for supreme comfort Heavy duty mechanism features gas height adjustment, asynchro mechanism and seat slide Integrated torsion control, allowing adjustment based on the users weight Five star base supplied with easy glide castors Supplied with height adjustable arms Black leather faced finish 2 year warranty