Ergonomic seating is designed around the interaction between the chair and the person using it. Rather than relying on a single feature, ergonomic performance depends on factors such as seat height, seat depth, backrest support, lumbar support, armrest positioning and the ability to adjust the chair to the user.
A well-designed ergonomic chair allows the user to maintain a supported posture without unnecessarily restricting natural movement. Adjustability becomes particularly important in shared workplaces where users have different body proportions and seating preferences.
Ergonomics also involves the relationship between the chair and the desk or workstation. A chair that is well designed in isolation may still provide poor working posture if its dimensions are incompatible with the surrounding workspace.