Office Chairs Wave-formed seat cushion distributes weight across a broader surface area, reducing stress on pressure points. Lumbar support applies consistent, gentle pressure to the lower back, encouraging a proper curve. Asynchronous controls to change angle of back to seat, tilt and forward tilt tension respond to the demands of every task. Upholstery has stain-resistant protection. Meets or exceeds ANSI/BIFMA standards. Some assembly required.