HercLéon’s new HercShirt V5.0 is made with materials like copper, silver, zinc, gold, and volcanic ash woven directly into the fabric. The company says these materials help fight odor-causing bacteria, absorb moisture, and keep the shirt smelling fresh. The premium version costs $79 and is advertised to stay odor-free for 30 days. There are also cheaper versions that claim to stay fresh for 3 days or 14 days between washes. While some of the materials are known to help reduce bacteria, there isn’t independent research proving the shirt can stay odor-free for a full month of daily wear.