Ergonomic DesignThe breathable mesh backrest of this ergonomic chair is designed with a bionic curve to help you automatically correct your sitting posture. Features recline tension adjustment,3 position recline lock and adjustable lumbar support design provides adequate lumbar support to relieve lower back pain, ideal for long hours of sitting. Shoulder-Friendly Design The mesh computer chair is designed with the human body in mind, providing essential support for your back and shoulders through its "Golden Triangle" design.