The Aeron in Onyx goes one step further. The seller is madisonseating and is located in this country US. This item is in the category Business & Industrial\Office\Office Furniture\Chairs & Stools. Aeron office chair revolutionized office seating with its defining design qualities the pioneering Pellicle suspension material and its patented PostureFit SL back support, which affords the ideal sit chest open, shoulders back, pelvis tilted slightly forward.