Six intimate designs: bionic chair back, elastic support, space improvement, breathable backrest, safe and stable, comfortable adjustment. Ergonomic backrest: Relaxed and comfortable, designed for the bending of the back spine, in line with the human structure, greatly reducing the discomfort of the spine caused by sedentary sitting. It has strong carrying capacity, and is more comfortable without tiring after sitting. Flexible castors, thickened materials, strong bearing capacity. Arc track is adopted, which is anti-skid and durable. The height can be adjusted freely to meet different requirements. The chair adopts air lift oil cylinder to control the quality from the source.