Flash Furniture Mid-Back Black Super Mesh Executive Swivel Chair with Leather Seat, Knee Tilt Control and Adjustable Arms Contemporary Office Chair Mid-Back Design Ventilated Mesh Back Material Height & Tension Adjustable Built-In Lumbar Support Knee Tilt Mechanism Tilt Tension Adjustment Knob Padded Black Leather Upholstered Seat Waterfall Seat promotes healthy blood flow Swivel Seat Pneumatic Seat Height Adjustment