Stay comfortable throughout the workday while seated in the 3718 Ergonomic Mesh Mid-Back Task Chair. The breathable mesh back is equipped with lumbar support and contours to your body for comprehensive support. A rolling base makes it easy to move around your workspace. Ergonomic task chair provides comfort throughout the day. Recommended for performance use 6-8 hours per day. Weight capacity tested to support 250 lb. Overall Dimensions: 41-9/16""H x 26-7/16""W x 17-1/2""D. All-elastic mesh mid-back design offers lasting support. Integrated lumbar support fits the natural curvature of the spine. Features a high-density sponge seat. Adjustable task chair features pneumatic height control, 360° rotation and rocking mode. Includes sculpted, fixed arms. Large 5-star base is equipped with multi-direction casters for use on tile, wood, carpet and other flooring. Assembly required.