One advantage that has helped to propagate the use of cotton as a face mask material is the substantial breathability available within the fibers. Cotton fibers process enough pores to ensure that users can breathe while having the face masks on. This same feature is present with hemp face masks. Hemp is a natural fiber similar to cotton which means it has substantial breathability with another added advantage of antimicrobial activity.
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Source : Why You Should Replace Your Cotton Face Mask with a Hemp Face Mask
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