Genuine Highly Adjustable Aeron with PostureFit Lumbar Support - Medium Size B - Graphite Frame Fully Adjustable Padded Arms, Forward Tilt, Tilt Limiter Highly Adjustable Size B Medium Chair with PostureFit and Fully Adjustable Arms Genuine Highly Adjustable Aeron with PostureFit Lumbar Support - Medium Size B - Graphite Frame Adjustable Padded Arms, Forward Tilt, Tilt Limiter The Aeron chair by Herman Miller is, simply put, the best ergonomic chair you can buy. The 12-Year Warranty covers everything that makes a Herman Miller Office Chair--including casters, tilts, pneumatic cylinders, and all moving mechanisms. IN STOCK FOR IMMEDIATE UPS CONTINENTAL USA GROUND SHIPPING!