Breathable ProGrid back with builtin lumbar support One touch pneumatic seat height adjustment Padded Coal FreeFlex (30) fabric seat Height adjustable arms Ratchet back height adjustment Nylon base with dual wheel carpet castersBreathable ProGrid back with builtin lumbar supportOne touch pneumatic seat height adjustmentPadded Coal FreeFlex (30) fabric seatHeight adjustable armsRatchet back height adjustmentNylon base with dual wheel carpet casters