Mesh Please be sure to select the correct 'Size'. H3 - For individuals under 5'11" (Under 180cm) H4 - For individuals 5'11" or taller (Over 180cm) ONYX COLOR - Color Code 23105 - Perfectly matches your Remastered Aeron Chair in comfort, quality, and color, with complementary Onyx Mesh. [MATCHES Remastered AERON CHAIR MODELS YEAR 2016 OR OLDER] WARRANTY COVERAGE – Includes a 12-year limited warranty, same duration as the Herman Miller Aeron chair. Headrest only; chair not included. ERGONOMIC DESIGN – Provides head and neck support to help maintain comfort and alignment during long sitting sessions. Designed for ergonomic performance. Free-Floating System – Tilt and height adjustments move freely. Forward and backward angles can be locked for a custom fit and lasting comfort. Engineered Now is proud to offer the fine-tuned H3 and H4 Headrest to enhance your Herman Miller Aeron, elevate your comfort and improve your productivity. From large corporations to home offices, these ergonomic add-ons are a must for every avid Aeron chair owner. Eliminate upper-back, shoulder, and neck pain by adding this headrest to your chair today!