About this item Ergonomic Backrest Design: Curved backrest can flawlessly line up with the human body curve and support your spines natural curve. The lumbar support system provides consistent support to your lower back BREATHABLE MESH BACK & SEAT: -The back and seat of the computer chair are wrapped with breathable mesh to allow air, body heat, and moisture to freely pass through, helping you maintain an optimaltemperature. Premium mesh has excellent elasticity and wear resistance and will not deform after years of use Robust Chair Construction: This mid-back office chair is constructed of hard-wearing polyester mesh, nylon star base, solid rolling casters and steel gas cylinder. It has passed BIFMA X5.1 Test and is recommended for office use for customers under 300 lbs 360° SMOOTH MOBILITY: -This ergonomic office chair is equipped with nylon swivel casters to make sure users can move with the chair effortlessly with a 360 degrees rotation. Sturdy materials of these five casters allow