Personally behind the ear loops are a fail.

- *not* comfortable especially for extended periods of time

- doesn’t hold mask firmly in place

2 separate elastics work well! Like 3M design ;-)

3M spent years improving the original masks from China in 1910. There’s gold in those designs.

We need to be prepared to wear masks for the next year (or more) for hours without touching.

Fabric masks are great because they are reuseable.

But it’s like underwear; change every day.

*Another interesting History of Masks. https://www.sixthtone.com/news/1005177/a-brief-history-of-face-masks-in-china

Couple of other requirements:
- 3 layers of COTTON; t-shirt material is sandwiched between the tight weave poplin

- wash in HOT water; it has to be sturdy

I’m not even going to get into The Nose issues. Suffice to say, my schnoz is not accommodated by masks from China >_<

Short intro to The Nose issues: the bridge HAS TO SEAL.

If you can feel air coming up your face or your glasses fog it’s not sealed.