Aeron Chair by Herman Miller - Official Retailer - Highly Adjustable - Graphite Frame - Lumbar Pad - Nickel Classic (Medium) 12-year Herman Miller warranty with Born-On-Date sticker. The new benchmark in the arena of ergonomic office, seating Highly Adjustable Mode: Adjustable Arms, Lumbar Support, Tilt Limiter and Seat Angle Adjustment, Tilt Limiter