This is unquestionably the best office chair I have ever owned. The adjustable head rest is exactly what I needed to take the load off my neck and keep my head in a healthy position for the sake of my posture, which needs help. The adjustable lumbar support is also just right for me, and the adjustable arm rests are perfect for allowing the chair to get in close to my desk, they raise and lower very easily. The chair rocks back with an adjustable tensioner, allowing me to ease some of the lower back stress. I can spend hours in this chair, which I could not do in my previous one. (However, its always a good idea to take a walking break every 1/2, hour or so, with any chair). The mesh back of the chair allows a cool, sweat-free back, very nice. Overall, a wonderful chair that has satisfied my individual needs perfectly!