Ergonomic Mesh Office Chair Desk Chair with 4D Adjustable Flip Armrests

1.adjustable seat height pneumatic/one-touch 2.adjustable tilt tension: yes 3.tilt lock: yes,3 positions 4.adjustable headrest: yes, height and angle 5.adjustable tilt angle: yes 6.lumbar support: yes 7.waterfall seat cushion: yes 8.adjustable arm height…