what is Layer of Cotton
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Explanation:
The three-layer fabric mask: research has shown that this combination of materials and layers provides a higher level of breathability and filter efficiency than one layer cotton masks.
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The three-layer fabric mask: research has shown that this combination of materials and layers provides a higher level of breathability and filter efficiency than one layer cotton masks. See what to look for whether you are buying a fabric mask or making one. Find out more about how to wear a mask from WHO:
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