HON FWCMHMMNT90T F3 Series Ilira Stretch-Back Work Chair, Mariner Upholstery Flexing back is constructed of ilira, a multidirectional stretch material that provides air flow and breathability ilira fabric is also soft and non-abrasive so it won't damage clothing Height and width-adjustable arms for a custom fit Five-star base has casters for easy mobility Indoor Advantage Gold Certification