Alera Envy Series Mesh High-Back Multifunction Chair, Supports Up to 250 lb, 16.88" to 21.5" Seat Height, BlackThis high 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. 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 control offers a wide range of movement, assists in spinal alignment and distributes users weight evenly.