Backrest The open mesh design creates a breathable, well-ventilated backrest. The office chairs backrest with lumbar support will help you keep in the right position during prolonged working Breathable Padded Seat The padded mesh seat is thick and resilient. Made of high quality thick sponge and breathable mesh cloth, preventing body heat and keeping your hip and legs sweat-free. Multi-function Mechanism 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 250 lbs of weight Smooth and Durable Casters The PU casters provides great mobility , suitable for hard floors, carpet and more, without noise during swiveling and the won't scratch the floors surface. Unrivaled Quality Designed and built using only high-quality material and mechanical structure.