LOUNGE TILT & TENSIONS CONTROL - Several adjustment features make it easy to find the right fit / ADJUSTABLE HEIGHT SEAT - Easy-to-use pneumatic height lever adjusts to allow users to select a working position that is ideal for them (Adjustable seat height 17-21.5H) COMFORTABLE Cushioned fabric upholstered seat measures 18.5" W x 17.5" D & Breathable mesh back with built in lumber support measures 17.5" W X 17" H