Ergonomic Office ChairThe ergonomic backrest and lumbar support fit the natural curve of your lower back, take the pain of spinal away from your body. It provides comfortable support which helps you to maintain a relaxed posture in a long hours of work. Space Saving & Adjustable ChairFlip-up Arms to meet different needs, you can push the office chair directly under the desk to use more area.Push in to lock in an upright position, and pull out to activate the rocking motion, Chair height is adjustable.