Just because a chair is labeled 'ergonomic' doesn't actually mean that it is really an ergonomically designed chair! We believe that an ergonomic chair will allow adjustment that fits the chair to your particular needs. It must be adjustable in height, back angle, seat tilt etc. It should allow a movement, a change of posture. We also think it should carry a 5 to 10 year warranty. With our office chairs we believe that it must be at least a "3 lever" adjustable chair.