This S-shaped mesh back provides exclusive comfort with lumbar support, breathable mesh leaves an elastic bouncy feeling of backrest; A perfect combination of mesh and artificial leather optimize our customers' sitting experience with thoughtful design; Sturdy metal frame with premium quality materials ensure this chair is durable and safe to use. The star base with five nylon castors allow 360° smooth and mute mobility; If you are expecting a little extra fun, the adjustable center-tilt tension meet right at your needs, please enjoy rocking back and forth during your intensive office hours, our elegant mesh office chair is developed for your best comfort!