Alday Intensive-Use Chair, Supports Up to 500 lb, 17.5" to 20" Seat Height, BlackAmple supportive cushioning in the seat and back deliver ergonomic shaping to fit a variety of body types. Durable plastic ergo core back and reinforced mechanism adds more comfort and overall strength. Back tilt helps to support a reclined posture and may allow a beneficial rocking motion that may help increase movement throughout the day. Wide five star base with casters provide extreme stability.