Deep cushioned back and seat conform to body contours for proper alignment, posture and all-day comfort. Curved polyurethane loop arms are soft yet durable. Meets or exceeds ANSI/BIFMA Standards. Manufacturer’s five-year limited warranty. Pneumatic seat height adjustment. 360° swivel. Tilt tension and tilt lock controls. Black five-star base with hooded casters. Seat: 20-3/4w x 21d. Back: 20-1/2w x 29h. Overall: 43-1/2" to 48". Shpg. wt. 47 lbs. Assembly required. Casters supplied with the chairs are not suitable for all floor types. Alternative casters are available to meet your specific needs.