The cushion design provides lumbar support which helps eliminate fatigue.Thickly molded cushions provide exception comfort and support. Fully upholstered seat and back. Seat has waterfall edge, pneumatic height adjustment, swivel/tilt mechanism with tilt lock and tension knob. The 24" 5-stat nylon base has 2" nylon carpet casters. Available in Fabric Grades I, II, III, IV, V and COM.