Mid-back chair features a breathable mesh back with adjustable lumbar support and cushioned seat with fabric upholstery. 3D rotation armrests with soft arm pads adjust to the right, left, backward, forward and in height. Functions include pneumatic seat-height adjustment from 20-1/8" to 24", 360-degree swivel and synchro tilt with lock. Five-star nylon base is equipped with 60mm dual-wheel casters for easy chair movement. Seat measures 20-7/8" x 18-1/2" deep. Back size is 20-1/8" wide x 24-3/8" high. Weight capacity is 250 lb..