Thick, wide cushions have bolsters for extra support and comfort. Task models feature pneumatic seat-height adjustment. Five-star base for stability. Fully-upholstered outer back. 7900 Series Arm Packs will fit 7700 Series Seating. Optional armrests are upholstered in matching fabric for extra comfort and a ''finished'' appearance; injection-molded armrests are color-matched to the base pedestal, arms and casters. Model 7901 features a hinged back which allows the back to pivot. Meets or exceeds ANSI/BIFMA and ISTA performance standards.