The S-shaped mesh back of this office chair provides exclusive comfort with lumbar support, The breathable mesh leaves an elastic bouncy feeling of backrest; An ideal combination of mesh and artificial leather offers a soft and cool sitting experience; Sturdy metal frame with premium quality materials ensures this chair is durable and safe to use. The star base with five nylon castors allows 360-degree smooth and mute mobility; If you are expecting a little extra fun, the rocking motion meets your needs, please enjoy rocking back and forth during your intensive office hours, our elegant mesh office chair is developed for your ultimate comfort!