Ergonomic Backrest - Designed with open mesh, SmugOffice Office Chair creates a breathable, well-ventilated backrest, which promises our ergonomic office chair backrest with lumbar support to help you keep in the right position during long time working. Comfortable Breathable Padding Seat - Made of thick sponge and breathable mesh material, our computer desk chair seat is thick and resilient, thus it is perfect to prevent body heat and keep your hip and legs sweat-free. Multi-Function Merchanism - Pneumatic controls make it easier to raise or lower the seat.The rocking mode of SmugOffice mesh office chaircan let you relaxed from the heavy daily work, pull out the handle to start rocking and pull it in to stop.