Mid-back chair offers a dramatically styled outback supports with a breathable mesh back, height-adjustable arms and a fabric seat. Adjustable height arms raise and lower arms, reducing shoulder, neck and back strain. Distance between arms is 17-3/4", and the height from the seat is 8-3/8" to 11". Other functions include pneumatic seat-height adjustment from 18-1/8" to 22-3/8", 360-degree swivel, tilt, tilt tension and tilt lock. Tilt adjusts seat and back to a reclined position for all-day comfort. Tilt tension adjusts the amount of resistance when reclining to accommodate individual weight and work styles. Tilt lock secures the chair in an upright position for constant back support when not reclining. Mid-back chair also features a five-star base with hooded 2-1/2" dual-wheel casters.