Look for a seat that is firm enough for it to support you without feeling too hard, and to keep you cool, a backrest that breathes so well. High-resilience foam makes long sessions much more comfortable. Mesh as another material can also make comfortable long sessions.
Breathability will become important for you if you work within a warm environment or sit still for extended periods. Seats that are well-padded along with a slight contouring help distribute weight in an even way, while mesh-backed chairs promote airflow to reduce heat buildup.
Strong frames, easy-moving casters, and silent recline devices may increase comfort and lifespan with structure quality. The investment won’t be worth it for a chair that loses shape, shifts, or squeaks after months.
Buy a chair for daily use that holds up, for your posture that supports, and for your body that fits. A truly ergonomic chair is in fact different. Those features are absent from standard chairs.