● SWIVEL, ADJUSTABLE HEIGHT MESH OFFICE CHAIR: 360 degree swivel, adjustable height mechanism, flip up armrest, supports up to 330 lbs. ● ERGONOMIC DESIGN OFFICE CHAIR: This office chair designed with human-oriented ergonomic construction, providing back support to reduce back pain caused by long time sitting. ● PASS BIFMA CERTIFICATION: BIFMA is the industry leader in developing furniture safety, durability, and sustainability standards that ensure product performance. Our certified office chair is high quality, environmentally that comes from a responsible manufacturer. ● SUPERIOR QUALITY MATERIALS: American-made high density mesh, high resilience foam cushion, SGS certificated gas lift cylinder. All materials are in good quality, durable, and not easy to deform. ● EASY INSTALLATION: Our office chair is easy to install. We offer installation instruction and video to help you.