Giantex Ergonomic Home Office Chair, Mesh Low Back Desk Chair, Swivel Computer Chair with Y-Shaped Lumbar Support & Comfy Armrest[Ergonomic Backrest & Armrest]: Designed with an ergonomic arc shaped backrest and Y shaped support, our office chair conforms to the curves of your body and effectively relieves back tension. Plus, the wide armrests allow your hands to relax comfortably. Therefore, you can sit to work or study for a long time without getting tired. [Adjustable Seat Height]: This seat height can be adjusted between 16" 21", and you can simply pull the lever beneath