Herman Miller Aeron Size C PostureFit SL Back Support Office Chair Back. Cosmetic appearance may vary slightly from pictured unit(s). Comes in non-original packaging. The chair is in good, used condition with some scuffs and scratches from previous use. No testing was performed. No manuals, cords/cables, or additional items are included if not listed or shown. (1) Herman Miller Aeron Size C PostureFit SL Back Support Office Chair Back. Description: Office Chair Back. Backing Material: Breathable Mesh. For questions regarding this item, please reference the SKU to help us better serve you. DougDeals Terms and Conditions. DougDeals Terms of Use. This item is guaranteed to be as described. See full terms here. DougDeals reserves the right to refuse service to anyone that does not comply with the terms listed and linked here. The sole and exclusive venue for any lawsuit arising out of or relating to this agreement shall be the Travis County Civil Courts of Travis County, Texas.