Adjustable Office Chair: This office chair has varieties of adjustable mechanisms: adjustable seat height, up to 140 degrees of tilting angle and rocking function, 2D lifting upholstered armrest, multi-angle adjustable headrest, 360-degree mute roller. Escort your efficient work. Ergonomic Backrest & Headrest: Ergonomic high back with adjustable headrest that designed for sedentary office workers, perfectly fit your spine which can significantly reduce your fatigue. Added with adjustable lumbar support to meet your different sitting posture needs.