Humanscale F211GV101 Freedom Task Chair with Headrest Revolutionary counter-balance mechanism provides perfect recline resistance for all usersautomatically Synchronous armrests move up and down together and stay with you during recline for supported balance. Unlike other chair designs, Freedom's armrests are attached to the back of the chair to ensure synchronous use. Independently adjustable seat, backrest and headrest fit virtually any body size Dynamic headrest cradles head and neck during recline and moves out of the way in upright positions