Engineered Now Headrest for Herman Miller Aeron Chair - H3 Standard (Black) A TOP QUALITY, QUINTESSENTIAL INVESTMENT FOR YOUR OFFICE - The H3 ENjoy is our Standard size headrest, providing great adjustability at a great price, and continues to be our most popular model. Comfortably fitting all users under 5'11". FULLY ADJUSTABLE - Three different adjustment options allow you to fully customize your experience, ensuring that your comfort is tailored to your personal preference. The headrest "Locks" into any position for strong support, but can still be adjusted freely by hand without having to get up from your chair. Patented design fits all Herman Miller Aeron Chair models and configurations. 100% GUARANTEED TO INCREASE YOUR COMFORT OR YOUR MONEY BACK - backed up by Amazons A-Z Guarantee. Additionally this headrest is backed by a 2 year manufacturer warranty.