JOBOON Ergonomic MidBack Office Swivel Chair with Adjustable Arms ,Tilt Mechanism,Ergonomic chair with Mesh Padded Seat ,Adjustable Task Mesh Office Chair Black The seat on this chair is scooped in design to ensure you sit centrally and gain the desired support from the complimenting shape of the backrest. Curve Design for backrest according to human S pattern ergonomic theory. T shaped arm is height adjustable and has been topped with a comfortable sculptured pad, which has been formed to allow maximum support for your arms. High- quality nylon base and casters for stability and durability;weight capacity up to 300 pounds. Simple pneumatic controls let you raise or lower your seat and rock back in your chair.Pulling out on the control handle, which allows your chair to tilt back, or sit forward and push the control handle in to prevent it from tilting. Meets or exceeds all BIFMA standards to guarantee the quality;Free component-exchange in two years.