Task chair offers an air grid seat and back with built-in padded – lumbar support. Mesh screen back provides increased breathability. Functions include one-touch pneumatic seat-height adjustment – 360-degree swivel – 2-to-1 synchro tilt control with adjustable tilt – tilt lock and tilt tension. Angled arms with soft pads are height adjustable. Heavy-duty – angled nylon base has oversized – dual-wheel carpet casters. Seat size is 20-1/2″ wide x 21″ deep x 3-1/2″ thick. Back size is 20-1/2″ wide x 18-1/2″ high. Distance between arms is 18-3/4″.