Contour seat and back with built-in lumbar support Back height and seat depth adjustment with pneumatic seat height adjustment for custom comfort Heavy duty nylon base with dual wheel carpet casters allow you to move smoothly and efficiently Overall size: 20" W x 22.5" D x 52" H - Approved for commercial use GREENGUARD Certified - an interior product made with materials that have low chemical emissions, improving the quality of the air in which it is used