This product is a heavy-duty, physio-approved desk chair designed for 24-hour use for users up to 152 kg. The chair is fully adjustable to provide the most support and comfort possible. A synchro mechanism allows the user to independently fix or free float the back rest and angle of the seat including forwarding seat tilt. An integrated seat slide accommodates the taller user, and a torsion control knob allows tilt tension to adjust to body weight.