Alera Envy Series Mesh Mid-Back Multifunction Chair, Supports Up to 250 lb, 17" to 21.5" Seat Height, BlackThis mid back chair features a crisp visual design and a variety of ergonomic adjustments at an irresistible price. Mesh back offers breathable support and conforms to the natural curvature of the spine. Lumbar adjustment adapts to support the lower back and can be adjusted to satisfy a variety of different users. Adjustable height and width arms move up and down, as well as, toward and away from the body to adapt to various body sizes. Asynchronous