Designed for the ultimate in style, comfort, and construction, the Alvin CH555 MONARCH executive office chair has contoured cushions and other ergonomic features that make it an outstanding value. High backrest provides solid orthopedic spine support and full-size upholstered seat is contoured for added comfort. Features include pneumatic height control, polypropylene seat and back shells, a height- and depth-adjustable backrest with tilt-angle control, adjustable seat pitch, dual-wheel casters, and a 23" diameter reinforced nylon base. Seat cushion is 19"w x 18"d x 3" thick. Backrest is 16"w x 19"h x 3" thick. Height adjusts from 18" to 23".