™ Antimicrobial Mold Resistant Sport Towel. Cupron towels resist the smell of mold for much longer than regular towels. The patented Cupron copper ion technology within the towels fibers fights back against the bacteria and fungus that cause mold and that musty moldy smell.  The Cupron antimicrobial fabric naturally eliminates 99.9% of the growth of bacteria and fungi that attack the towel materials.