I'm aware of these things, although the last time I went looking it was hard to find major US brand masks. Seems to be a bit better now. The KF94 masks I have

I'm aware of these things, although the last time I went looking it was hard to find major US brand masks. Seems to be a bit better now. The KF94 masks I have come with a little hook that you can use to connect the ear loops in the back. This produces a tighter fit and also saves your ears.