Chair with powder coated aluminum 5 way swivel base on castors (available for hard and soft floors, color matching base), fitted with gas-lift mechanism for height adjustment. Seat with built-in self-tensioning weight response mechanism, backrest with 3-position recline, adjustable lumbar support breathing up to 2 3/8". Low backrest with visible backshell (available in black or white), front in polyester mesh in matching color. Seat upholstered in leather, customer's leather, coated fabric, fabric or customer's fabric. Fixed or adjustable armrests in nylon fiber, color matching backshell, are available upon request and with a surcharge.