Breathable VeraFlex back and seat with built-in lumbar support 1-touch pneumatic seat-height adjustment . 40H x 27W x 26 1/2D chair with 40-44 1/2 adjustable height range. 2-to-1 synchro tilt control with adjustable tilt tension . Height and width adjustable arms with polyurethane pads . Heavy-duty angled nylon base with oversized dual-wheel carpet casters. Meets or exceeds ANSI/BIFMA standards. Easy assembly is required. Backed by the manufacturers limited lifetime warranty.