Which type of fabric is not affected by moisture and mildew?

Fiberglass fabric is not affected by moisture and mildew due to its unique properties. Unlike organic materials such as cotton, nylon, and polyester, fiberglass is made from glass fibers, which do not absorb water. This non-absorbent nature means that fiberglass does not provide a conducive environment for mold and mildew growth, making it an ideal choice for various applications where moisture exposure is a concern, such as in marine and aviation environments.

Other fabrics like cotton, nylon, and polyester can retain moisture, potentially leading to issues with mildew and degradation over time if not properly maintained. Fiberglass, however, maintains its integrity in humid conditions, which is why it is sought after for durability and longevity in contexts where moisture is a factor.