I use 100% cotton. Cotton is my fabric of choice because It will not irritate the skin.
2 layers so you can still easily breathe. 2 layers also gives the stability to the product so they fit better. You want the mask to fit close to the skin, no gaps. You can tie knots in the elastic if you require a tighter fit.
The size & design was what was recommended by the CDC
You will need to wash and dry before using (and in between uses) Hand Washing is best as the elastic will last longer. Front load machine will also work (but elastic won’t last as long) DO not wash in top load machine
Do NOT handle the fabric keep your clean fingers on just the elastic part.