LORELL Dex Adjustable-Height Task Chair provides convenient, comfortable and versatile seating options. Curved, molded-plastic seat backs provide ergonomic support to reduce fatigue and back pain. Contoured, molded-foam seats come upholstered in easy-to-clean antimicrobial Polyurethane upholstery to help prevent the spread of germs. Fixed metal arms feature Polypropylene padding to provide additional comfort to your seating experience. Simple mechanism with seat-height adjustment allows accommodation of persons of most heights. Metal bases feature a powder-coated surface and metal cover for added durability. Five-star base moves on 2" smooth-rolling hooded casters and allow 360-degree swivel for increased mobility.