Our 30-packs of disposable mask filters provide greater than 98% filtration efficiency for 0.1 micron particles when used in conjunction with any NW Alpine mask. Each filter is made of the same material used in N95 masks (electrostatic charged non-woven melt-blown polypropylene).
Made in the USA in our own factory with USA-made meltblown material.
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Please note these masks are not intended for use in medical situations and have not been approved by the FDA.
Final Sale: Sorry, we do not accept returns or exchanges on masks or filters.