The ergonomic chair has many advantages compared with traditional office chair. The improved backrest closely fits the real spine curve of the human body. Moreover, newly added back lumbar support further freed your lumbar, exert more vigorous support effect. 90° Flip-up armrest can lift up and down as you wish. Free your hands and relieve the elbow fatigue. Fully upright armrest can release more space to fit big size. Unique rocking function let you swing freely from 90 to 120 degrees. Control the rocking tension by switch knob underneath the seat. The backrest was made of high density mesh , which is a kind of breathable and durable material. Increase the wind volume and promote air circulation. Keep your body dry all the day. Soft padded thick armrest and cushion, high elasticity and powerful support, let you fully enjoy the pleasure of work in a mild mood.