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Spunbond non-woven polypropylene (NWPP) will hold up through laundering and can be recognized by its signature, dimpled texture. Reusable grocery bags or conference bags are made of spunbond NWPP. Other NWPP materials can be used to make masks, but will not survive multiple washes.
For information on what non-woven polypropylene is and how to determine which variety is most suitable for masks, please visit the Maker Mask organization’s website: https://makermask.org/materials