This is the office chair with a unique tilting mechanism that reduces stress on your back and legs. Common chairs tilt awkwardly with the back reclining alone or with the seat at a 1:1 ratio--placing unwanted strain on the thighs and lower back. In contrast, this chair's back and seat tilt synchronously in an ergonomically superior 2:1 ratio that feels more natural. The all-steel frame is contoured to allow the breathable mesh fabric to conform to your body, creating a comfortable working position without sacrificing support. A knob under the seat lets you customize the tilt speed and tension while a pneumatic control lever adjusts the seat height from 16" - 19 1/2". A leather-upholstered headrest and padded armrests that pivot in unison to support the forearms and elbows offer additional comfort and prevent fatigue. The steel five-prong base provides greater stability than lesser four-prong bases and rolls smoothly on dual-wheel hooded casters. Black. 53 1/2" H x 24" W x 23 1/2" D. (66 1/2 lbs.)