OKAMURA CP Limited Edition Office Chair with Orange Cushion seat and White Gradation Support Mesh back is a cutting-edge ergonomic chair with exceptional seating comfort from the world-renowned Italian design firm Giugiaro Design. Gradation Back Support Mesh Gradation support mesh chairs with varying densities. The lower back area is made firmer for better lumbar support. The upper back area is less firm, offering more comfort. In this case, the chair does not need the Lumbar Support.