Lorell  Ergonomic Chair, w/Arms, 27-1/4"x25-1/2 x41-1/2, Black High-performance ergonomic chair with contoured seat and back includes built-in lumbar support for optimum support. functions include pneumatic seat-height adjustment, 360-degree swivel, and 2 to 1 synchro tilt control with adjustable tension and til T lock. mid-back chair also offers padded adjustable arms and heavy-duty nylon base with dual-wheel carpet casters. weight capacity is 225 lb. chair meets or exceeds applicable ansi/bifma standards.