The open mesh design creates a breathable, well-ventilated backrest. The office chair backrest with lumbar support will help you keep in the right position during prolonged working.The padded seat is thick and resilient. Made of high-quality thick sponge and breathable cloth, preventing body heat and keeping your hip and legs sweat-free.Pneumatic controls make it easier to raise or lower the seat. The rocking mode can relax you from heavy work, pull out the handle to start rocking and pull it in to stop. This chair can support up to 300 lbs of weight.The PU casters provide great mobility, suitable for hard floors, carpets,s and more, without noise during swiveling and they won't scratch the floor's surface. Color: Gray.