The 5500 basic design of Antimicrobial Dillon Back and Seat Managers Chair is an excellent example of simplicity at its best. AirGrid Back with built-in lumbar support conforms to your back for passive ergonomic support. Seat is thickly cushioned for enhanced comfort. Both seat and back are upholstered in antimicrobial vinyl for easier cleaning and longer-lasting use. Functions of this professional chair include One Touch pneumatic seat-height adjustment, 360-degree swivel and 2-to-1 synchro tilt control with adjustable tilt tension. Angled arms with soft pads are height-adjustable. Heavy-duty, angled nylon base has oversized, dual-wheel carpet casters.