Boss - BOPB6566GYBK Task Chair features a synchro-tilt mechanism that allows the backrest and seat to tilt in unison to provide enhanced comfort and ease. Breathable, mesh back increases airflow to keep you cool. Pneumatic gas lift mechanism and adjustable arms allow you to quickly adjust the height of the chair and arms to work comfortably in any area. Sturdy base with dual-wheel casters provides smooth, effortless mobility. Task chair is designed to support up to 275 lb.