The WHO advises people to wear three-layer masks when they can't physically distance

Inner layer

Non-woven cotton forms final absorbent layer next to the face

Outer layer

Water-resistant synthetic material such as polypropylene limits droplets reaching nose and mouth

Middle layer

Material like polypropylene, which scores highly for filtration and reathability

Source: WHO

The WHO advises people to wear three-layer masks when they can't physically distance

Outer layer

Synthetic water-resistant material such as polypropylene limits droplets reaching nose and mouth

 

Middle layer

Material like polypropylene, which scores highly for filtration and breathability

Inner layer

Non-woven cotton forms final absorbent layer next to the face

Source: WHO