Breathable black vertical mesh back with adjustable lumbar support Onetouch pneumatic seat height adjustment Height adjustable back with dual steel frame post Height adjustable arms Seat slider 2to1 Synchro tilt control with 3position lock Optional adjustable headrest (HR33B) available Patent pending Polished aluminum base with dual wheel carpet castersBreathable black vertical mesh back with adjustable lumbar supportOnetouch pneumatic seat height adjustmentHeight adjustable back with dual steel frame postHeight adjustable armsSeat slider2to1 Synchro tilt control with 3position lockOptional adjustable headrest (HR33B) availablePolished aluminum base with dual wheel carpet casters