STYLE, DURABILITY AND COMFORT All of our Ergo chairs were engineered with your total comfort in mind. Aesthetics, form and function are merged seamlessly in a single design, and allows the Ergo chairs to be minutely adjusted to achieve unrivaled ergonomic fine tuning. A synchro-tilt mechanism with infinite lock, sliding seat, pneumatic height adjustment, and headrest are options on all Ergo models. tilt tension control tilt lock back angle adjustment synchro-tilt seat height adjustment waterfall seat back height adjustment seat depth adjustment width adjustable arms arm height adjustment swivel arm adjustable arm depth v2 open design mechanism single lever adjustment greenguard certified Overall Dimensions: (w x d x h) 26.5 x 29 x 46-52h (mid 39.5-45.5h) Seat: (w x d) 20.5 x 18.5 Back: (w x h) 20.5 x 28 Seat Height: 19.3-24