The seat and back of this office chair is upholstered in high strength web mesh that offers elastic, breathable comfort and full body support. Mesh executive chair has a plastic trim back and seat for long life. Built-in lumbar support provides added back comfort. Height adjustable armrests help reduce arm fatigue. This ergonomic mesh chair includes independent back and seat angle adjustment and tilt lock control. 17-3/4 to 21-1/4″H pneumatic seat height adjustment. Stable 5-blade nylon base includes dual wheel swivel casters for easy mobility. Seat measures 20″W x 18-1/2″D. Back measures 19-3/4 x 23-1/2″H.