The accessories include headrests footrests cushions and back support. To optimize your office chair for back support the first step is to adjust the seat height to your body. Premium High Back Mesh Office Chair By Comfort Designs Ergonomic The accessories include headrests footrests cushions and back support. Office chair back support . Once you ve adjusted the height sit in the chair and adjust the cylinder to the ideal height. A lumbar back support helps promote good posture by simply filling in the gap between the lumbar spine and the seat supporting the natural inward curve of the lower back. For best results your knee caps should be a bit above the seat pan. It adjusts from 34 8 to 38 5 inches tall. Designed to help support your spine promote circulation and even help improve concentration lumbar support cushions help you remain comfortable through long days. Office chair lumbar back support is important the lower portion of the spine just above the buttocks naturall...