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Must be made of at least 3 layers, 2 layers should be tightly woven material fabric, such as cotton or linen. The third (middle) layer should be a filter-type fabric, such as non-woven polypropylene fabric. Be large enough to completely and comfortably cover the nose, mouth, and chin without gaping, allow for easy breathing. Fit securely to the head with ties or ear loops. Be comfortable and not require frequent adjustments. Be changed as soon as possible if damp or dirty, maintain its shape after washing and drying
