Size:Medium B | Color:Standard Casters Herman Miller Aeron Chair Basic Classic Carbon Graphite Model with Lumbar Support Pad, Fixed Arms, Rear Tilt, Rear Tilt Tension Knob and Vinyl Arm Pads - Home Office Desk Task Chair - The Aeron chair by Herman Miller is simply put, the best ergonomic chair you can buy. No other office chair works harder to relieve your back and neck pain than the Aeron chair. The high tech mesh fabric means that this chair doesn't look (or work) like other conventional office chairs. But what makes it different makes it better! The patented material on the Aeron distributes pressure evenly over a wider area. The result? You'll stay cool and comfortable no matter what the season. Described as the most comfortable chair in the world and designed with high-tech materials using body-friendly engineering, the Aeron chair comes in three sizes to fit all body types.