Whenever official rule and regs are given to start lifting the lockdown, if wearing masks in public is not made mandatory, I despair!
In my (humble) opinion, what's the point of debating masks, yes or no? Unless it is proved conclusively that the wearing of masks encourages the spread of the virus, then EVERYONE should have to wear one. Whether we are incubating the virus or not, we should be trying to keep others safe all of the time.
Few things to consider? If you can blow out a candle, through your mask, no good. This should make us consider carefully the weave of the fabric we choose.
Cotton is the most absorbent, but not indefinitely - so a fresh mask should be worn after 4 hours.
Kill the virus by always washing masks @ 60 degrees C. minimum and for a minimum of 30 mins in the machine.
Having a pocket in the mask for something like a vacuum cleaner disposable bag or paper coffee filter inside is a good idea.
Mask must cover nose and mouth and best to incorporate piece of pipe cleaner, paper clip, wire, etc., sewn in place inside above nose that can be squeezed to fit bridge of nose, this gives extra fit and protection.
Yes, get those production lines going and stay safe. Very well done, the Czechs!!
Best wishes from a busily sewing town in S of France ??