Fungus and mildew have no effect on which fabric?

Polyester is a synthetic fabric that is inherently resistant to the effects of fungus and mildew. This resistance is primarily due to its chemical structure, which does not provide the organic nutrients that these organisms typically thrive on. Unlike natural fibers such as cotton and silk, which can absorb moisture and provide an environment conducive to mold growth, polyester remains less susceptible to such issues, making it a popular choice in applications where moisture management and durability are critical.

In contrast, fabrics like cotton and silk are more vulnerable to mildew and fungus because they are organic and can retain moisture, creating favorable conditions for these fungi to develop. Nylon, while also a synthetic fabric, does not have the same level of resistance as polyester and can be affected under certain moisture conditions.