Seating Chairs by Mayline Tailbone cut-out in seat cushion. Ratchet back height adjustment. Waterfall seat design. Multi-Function – Three levers to modify angle of back relative to the seat, control tilt and forward tilt for keyboard intensive activities. Tilt is free float or locking within a fixed range. T-shaped arms are height adjustable and have comfortable impact resistant urethane arm rests. The Seat Height is 18 1/2″ at its lowest point and 22 1/2″ at its highest.