[Mr Rogers]

I recommend this one:

Or one of these:

Of course, only for when one MUST wear a mask due to government regulation - such as needing something from a government office under an oppressive regime, where refusing only hurts YOU, not them.

https://fakemaskworldwide.com/mask/

[HartleyMBaldwin]

In the earliest days of masking I made one out of cheesecloth and yarn. Quite breathable, but the cheesecloth got soggy pretty quickly from breath moisture.