It is believed that everyone has already felt the heat of summer as the outdoor high temperature of over 30 degrees has turned everyone into a burnt-out man. Even if wearing cooling clothes, they are still sweating. But because of the COVID-19 pandemic, we have to continue to wear face masks when we travel to public areas this summer! Especially after walking out for five minutes, it was so stuffy that we couldn't breathe, along with mask wet with sweat, which made people feel very uncomfortable. How to solve this problem?