Monofilament (Mono) is an extremely sheer mesh used to make a transparent base that creates a realistic looking scalp area and is then hand knotted with individual fibers to simulate the appearance of natural hair growth. A Monofilament Part (Mono Part) cap contains a wide Mono Part area on a machine-made cap and allows the wearer to style a conventional part or a more fashionable zigzag part for the most realistic appearance.