Donít be deceived by the simple design of this mesh back chair Ė it has a weight capacity of 500 pounds, is rated for 24/7 use, and will offer comfort to big and tall workers all day long. The screen mesh back rest delivers superior breathability, and itís ergonomically contoured. The seat is thickly padded for outstanding comfort. Other features include built-in lumbar support, back tilt, back height adjustment, a reinforced control mechanism, and 360-degree swivel. The seat upholstery resists staining and is easy to clean. Optional adjustable arms are available. This chair carries a limited lifetime warranty, and ships in 2-3 business days.