Alera Envy Series Mesh High-Back Swivel/Tilt Chair, Supports Up to 250 lb, 16.88" to 21.5" Seat Height, BlackThis high back chair with breathable mesh back has swivel tilt with lock and tension control which allows users to adjust to the demands of the workday. Controls are easy to reach and simple to understand. Lumbar support can be adjusted to fit a variety of users. Built in tilt tension controls the rate and ease of recline while tilt lock secures the chair in the full upright position. Height and width adjustable arms provide added comfort. 360 degree