COOLMAX21 Compliant with Japan Industrial Standard "JIS T9001"! According to the JIS T9001 standard for masks for general use, there are four collection functions*, pressure loss (breathability), We have regulations on safety and hygiene items. * Fine particles, flyers containing bacteria, droplets containing viruses, pollen particles Even though it is a washable cloth mask, it has the same filter performance as a non-woven mask. It is a high-performance mask that makes full use of cutting-edge technology. In 20 wash-resistant tests, it has been confirmed that the filter performance and shape are almost unchanged. It is a sustainable mask that can be used repeatedly and is environmentally friendly.