Boss Office Products B6018-HR Mulit-Function Mesh Task Chair with Headrest in Black Ergonomic open mesh back designed to provide exceptional back support Open mesh seat, ergonomically designed; Adjustable height and width armrests 3 paddle multi-function tilting mechanism, which allows the seat and back to be independently adjusted and locked in any position Pneumatic gas lift seat height adjustment; Adjustable tilt tension control Large 27" nylon base; Hooded double wheel casters; With optional headrest