Head Support for Herman Miller's Aeron Chair. Ergonomic support to fit 95% of the population. Fits all sizes and vintages of the Aeron chair. Attaches to the Aeron chair in less than a minute with the included tool. Manufactured from high strength engineering resins and steel. Easily adjusts to postural changes throughout the day. Supports the reclined postures desireable for conversation, reading and contemplation. Prevents muscular fatigue and skeletal distress