Engineered Now Headrest for Herman Miller Aeron Chair H3 Remastered – Graphite. An ergonomic headrest designed specifically for the Herman Miller Aeron chair (Remastered models from 2016 or older). This H3 size fits individuals under 5 feet 11 inches. Finished in Graphite color to complement Onyx Mesh, the headrest provides head and neck support with a free-floating adjustment system and lockable angles. 7.0 x 12.6 x 11.0 inches.