A durable metal frame, along with a quality mesh or fabric, and durable adjustment mechanisms, are important for the long-term durability of an ergonomic chair. Brands using quality components are less likely to sag, tear, or otherwise deteriorate than brands that use components made with inferior materials.
Gas lifts, armrest joints and tilt mechanisms are other important parts of a chair, and if they are to last, they need to be kept clean and used gently.