100% Nylon MULTIFUNCTIONAL MESH OFFICE CHAIR: 360° swivel, height adjustable, flip up armrest, adjustable lumbar support, rocking mechanism with tilt tension adjustment knob, high quality gas lift cylinder, durable nylon base and flexible 360°swivel casters ERGONOMIC OFFICE CHAIR: This office chair designed with adjustable padded lumbar support (adjustable range: 1.97 in), providing good back support to reduce back pain. The lumbar support padded with a sponge to provide all-day comfort FLIP UP ARMRESTS: Fold up the armrests when not in use and slides this office chair under the desk for space-saving. The armrests can be removed easily, changing the chair into an armless chair in seconds whenever you want BREATHABLE MESH OFFICE CHAIR: The thick seat, padded with good quality sponge and covered by American-made mesh, is comfortable, breathable, resilient and not easy to deform. High density mesh back offers firm back support and good breathability EASY TO ASSEMBLE: Our of