Flash Furniture LF-W42B-GG Mid-Back Super Mesh Office Chair with Black Fabric Seat Contemporary Office Chair Mid-Back Design Ventilated Mesh Back Material Height & Tension Adjustable Built-In Lumbar Support Tilt Lock Mechanism Tilt Tension Adjustment Knob Padded Black Mesh Upholstered Seat Waterfall Seat promotes healthy blood flow Swivel Seat Pneumatic Seat Height Adjustment