Ideal for installations with multiple applications and height ranges. For 24/7, intensive-use. Adjusts 8" up or down pneumatically while seated and an additional 10" manually with patented Wave Tube Extension. Oversized seat and back are covered with microcellular, self-skinning polyurethane foam. Backrest adjusts 3" in height and depth with use of ergo knob and backrest tilts 22 . Seat tilts 10° with paddle lever controls. Large base ensures stability. Wide-angled footrest provides secure footring and ergonomically correct leg position.