Steelcase Amia  Fabric Office Chair, Black 10 Year Warranty Exclusively with DesignerSeating Arms telescope in and out, move forward and back, pivot and adjust up and down so you can find a natural position that comfortably supports your needs Live Lumbar technology contours to fit your spine for continuous lower back support as you move in your chair Weight tested and warranted up to 400 lbs. with no loss of performance