One of the first choices when buying an office chair is the seat and back material: breathable mesh or cushioned foam. Both can be comfortable and both can be miserable; it depends on the chair and on how you sit. Here is how to choose.
Mesh: pros and cons Mesh is a tensioned fabric stretched over a frame. Its biggest advantage is airflow, which keeps you cool during long sessions and in warm rooms. Quality mesh also conforms to your body and distributes weight evenly.
Watch out for: cheap mesh can feel hard or dig into the backs of your thighs at the front edge of the seat. The quality varies enormously, so mesh is one area where price often does correlate with comfort.
Foam: pros and cons Foam (usually molded over a contoured base) offers a plush, cushioned feel that many people find more immediately comfortable. It provides consistent support and is forgiving on the seat edge.
Watch out for: foam traps heat, so it can get warm during long sittings. Lower-density foam also compresses and flattens over the years, losing support.
A common hybrid Many of the best chairs split the difference: a mesh back for ventilation and support, paired with a cushioned foam seat for all-day comfort. This combination is often the most comfortable of all and is worth seeking out.
How to decide - You run hot or work in a warm room: lean mesh, and buy a good one. - You want plush, immediate comfort: lean foam, ideally high-density. - You want the best of both: look for a mesh-back, foam-seat hybrid.
Whichever you choose, prioritize adjustability and seat-depth fit over the material itself. A well-adjusted foam chair beats a poorly fitted mesh one every time.