What about the NASK mask? I've seen a lot of publicity recently.

It's a product of North China Pharmaceutical Group, which seems to be imported from Hong Kong. It is quite thin, and the anti-fog effect is quite good, which can reach 99.8%. The key is particularly breathable, with a permeability of 99.9%. Usually I don't wear a mask, I'm flustered, but this is really good. Recommend one to try. Huayao is an old state-owned enterprise and may not pay much attention to advertising, but this mask is really good.