Flaunt your style with Expression Office Chairs United Chair has a new line of seating and a new microsite that allows you to interact with it. Expression offers colorful and ergonomic solutions to today’s seating challenges. All models are equipped with a 4:1 ratio synchronous mechanism and sliding seat pan to make it easy for you to get comfortable. You can brighten your workspace with a choice of five mesh backrest colors and a variety of chrome accents. Expression office