Yangming Office Chairs with Lumbar Support, 250 lb. Capacity, GreyThe Compact Ergonomic High-End Mesh Chair: From Yangming, An Exciting Growth Story in Ergonomic Furniture. Experience health and comfort with our advanced technology millions of happy users and countingErgonomic 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 workingBreathable 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 weightSmooth and Durable Casters: The PU casters provide great mobility, suitable for hard floors, carpet, and more, without noise during swivelling and they wont scratch the surface of the floor.Unrivalled Quality: Designed and built using only high-quality material and mechanical structure.We strongly recommend reading the user manual before starting to assemble.Assemble tools are included.