This office chair is equipped with adjustable headrest, comfortable lumbar support and adjustable armrests, which will meet needs of different people. The entire back of the chair is designed in accordance with ergonomic theory to provide comfortable support for your back and relieve the pressure on the muscles of the various parts of the back. More importantly, this ergonomic office chair can help to improve your sitting posture, more conducive to the health of the spine of sedentary office workers. specifications colour: black back type: high back material: mesh+metal+plastic overall dimensions: 63cm x 63cm x 114-124cm assembly required: yes number of packages: one package included: 1 x office chair 1 x instruction | Advwin Ergonomic Office Chair Mesh High Back Desk Chair With Lumbar Support Adjustable Headrest Black