Comfortable Ergonomic Office chair Hbada office chair is designed to provide maximum comfort and support, with ergonomic features such as 2D adjustable lumbar support, adjustable headrest and liftable armrest, and a thick seat cushion. It's easy to adjust seat height, headrest, backrest and arms to meet different needs, good for sitting long hours. Encourage S-Shaped Spinal Posture An ergonomic chair with proper support always maintain a healthy spine posture and will not have a damaging and flattening effect on your back. Good 2D lumbar support will minimize strain or pain on the lumbar discs in your spine, which also can lift 1.8' and rotate 45 to place your waist in a proper sitting posture. The adjustable headrest prevents you from hunching forward, scrunching your shoulders. Don't be slouching, this is the culprit.