Knack boasts an uncluttered and traditional design that makes it an essential and affordable choice for corporate, healthcare, government and educational settings. The soft, comfortable back follows the natural curve of the spine, providing great support for hours of sitting. Five control selections and a Heavy Duty 24/7 option make Knack a great all-around task chair. Knack includes a back-height adjustment so every user can enjoy individualized upper-back and lumbar support.