Mid-back task chair provides an ergonomic solution with many comfort features, including pneumatic seat-height adjustment, 360-degree swivel, tilt, tilt tension and tilt lock. Seat size is 20" wide x 19" deep. Back measures 21" wide x 23-1/2" high from seat. Included arms with urethane arm pads adjust in height. Distance is 19-1/2". Chair is upholstered with 100 percent polyester fabric. Black frame features a steel structure with polymer covering and five-star base with 2" hooded dual-wheel carpet casters.