Engineered Now The Original Headrest for The Herman Miller Aeron Chair (H4 for Remastered, Onyx). 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! Product Dimensions: 12″D x 7″W x 8H. Size: H4 for Remastered. Special Feature: Adjustable Headrest. Unit Count: 1.0 Count. Recommended Uses For Product: Office. Age Range (Description): Adult. Included Components: Headrest, Hex tool, Replacement Bolt for A-Size Chairs, Spare Caps, Instructions. Surface Recommendation: Hard Floor. Furniture base movement: Swivel. Seat Depth: 12 inches. Item Weight: 3.5 pounds. Country of Origin: Taiwan. Item model number: Engineered_Now_Headrest. Form Factor: Mesh with Frame. And we will work with you to resolve it to your satisfaction.