JOBOON Ergonomic Modern Seating Mesh Back & Seat Executive Office Chair with Adjustable Arms and Tilt Tension Lumbar Support Managers Chair Black Breathable mesh seat and back with built-in lumbar support.New arrival promotion! Mesh padded flip-up & adjustable arms are great for you to get a good position for typing. Heavy duty nylon base and casters for stability.Weight rated up to 250 pounds. Wonderful tilt tension control enables to lock in a firm upright position.One touch pneumatic seat height adjustment. Meets or exceeds BIFMA standards to guarantee the quality and meets the ca117 fire-retardant standard;2-year free component-exchange.