When form and function are perfectly divided. Seat cushion contours reduce pressure points to provide support exactly where needed. ilira-stretch M4 knit fabric back cradles spine. Additional support bar on back frame increases overall strength. Controls on this chair are easy to reach and simple to understand, featuring only one lever and front-access tilt tension. Synchro-tilt mechanism reclines the back at a higher ratio than the seat for proper back alignment. Warranted for users up to 300 lbs. Height- and width-adjustable arms.