Details [Ergonomic Design]There is an adjustable lumbar support designed for your waist on the seat back. And the seat back can be adjusted up and down as a whole. They can both be adjusted to fit user height and are ergonomically designed to fully fit your waist and relieve back pain. [Height Adjustable Design]The ergonomic office chair high back height can be adjusted from 19.3 in-23 in. The armrests can also be adjusted by 2 inches and you can push your chair under the table to save space. [Tilt Lock and Tension Adjustment]Our chair supports three levels of tilt and lock. At the same time, you can control the tilt tension by adjusting the knob, which allows you to choose freely. [Perfect Head Support]Our headrest is adjustable for height(up/down) and angles(front/rear) and users can adjust it according to their preference.The headrest fits perfectly around the neck, allowing you to relax while working. [More Comfortable Mesh Backing Office Chair]We've chosen a denser, softer mesh to