Knoll Life Chair in Black - Fully Adjustable Flexible back frame follows user movement and ensures constant support Synchronized recline is counter-balanced by the user's body weight, eliminating the need to adjust tension when engaged Controls adjust easily from a seated position and are automated wherever possible Flexing seatpan with waterfall edge, plus a unique cut-out pattern with a ribbed under-structure combine to provide a sleek, unique support system that noticeably reduces pressure points 10 Year Warranty With Madison Seating