Flash Furniture Mid-Back Black Mesh Swivel Task Chair with Flip-Up Arms Contemporary Task Chair Mid-Back Design. Seat Size- 20.25 W x 19 D inches. Seat Height- 17.25 - 20.75 H inches Back Width: 17''-20''. Weight Capacity- 250 pounds Ventilated Mesh Back Material Built-In Lumbar Support Tilt Lock Mechanism Tilt Tension Adjustment Knob Padded Black Mesh Upholstered Seat Waterfall Seat promotes healthy blood flow Swivel Seat. Padded flip-up arms