Materials needed are:
A bandana
2 pieces of string/cord
1 elastic hair tie
Tie the ends of the cord together to make loops as shown above. The pieces I used were about 20 inches long and made loops about 9 inches long after they were tied. Then take each one and loop it through the elastic hair tie, one on each side as below.
Pull them tight.
Next up is the bandana. Lay it out flat.
Fold about 1/3 of one edge over.
Then fold the other edge over the first one.
Take the loops of cord and put the folded bandana into them.
Then space the loops on each side dividing the bandana into thirds as below.
Fold one side over the center third.
And repeat with the remaining side.
Take the last piece you folded and fold each corner to the center as below.
Then take the top layer of the other side and place the folded section inside it.
Push it in as far as it will go and unfold the corners and tuck them in tight.
Move the elastic and cord to the top of the folded bandana.
Place one hand into the center and pull up with the elastic to pull the sides in and you’re ready to slip it on.
Hair tie goes in the back of the head and one side of each loop goes over the top of each ear. Adjust the top and bottom to fit tightly around your nose and chin and you now have 9 layers of cloth for filtration.
Hope this helps. Stay safe out there!