A neckline sweat and dirt guard patch is a kind of fabric or other material that is used to protect the neckline of a garment from sweat and dirt. It is typically applied to the inside of the neckline and is designed to absorb sweat and prevent it from seeping through to the outer surface of the garment. The patch may also help to prevent dirt or other contaminants from coming into contact with the neckline of the garment, which can help to keep the garment looking clean and fresh.
