About this item SWIVEL, ADJUSTABLE HEIGHT MESH OFFICE CHAIR: 360 degree swivel, adjustable height mechanism, flip up armrests. ERGONOMIC OFFICE CHAIR: This office chair designed with human-oriented ergonomic construction, providing back support to reduce back pain caused by long time sitting. HIGH QUALITY OFFICE CHAIR: Our 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.