Herman Miller Classic Aeron Task Chair: Highly Adj w/PostureFit Support - Tilit Limiter w/Seat Angle Adj - Fully Adj Vinyl Arms - Carpet Casters AE213AWBPJXTBBS83V01 Aeron Size B - Posture Fit, Titanium, Classic Pellicle, Zinc GENUINE HERMAN MILLER AERON SIZE B - Fully Adjustable + Warranty Aeron Size B - PostureFit Lumbar Back Support, Titanium Smoke Frame, Classic Zinc Pellicle, Adjustable Padded Arms, Forward Tilt, Tilt Limiter The 12-Year Warranty covers everything that makes a Herman Miller Office Chair--including casters, tilts, pneumatic cylinders, and all moving mechanisms. The Aeron chair by Herman Miller is, simply put, the best ergonomic chair you can buy.