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InterMask 3 Ply Procedure Face Masks, ASTM Level 3, are disposable with a Hydrophobic non-woven outer layer, Meltblown middle filtration layer, and a soft absorbent non-woven inner layer. Tested to ASTM Level 3 at Nelson Labs, this protective single-use face mask has 3 layers of protection that helps to filter microbes from entering or exiting the mask while maintaining smooth breathability. Quality product manufactured in an FDA registered facility following standard procedures. Shingle pleats rectangular face mask with a shapeable nosepiece and two elastic ear loops present, one on each side, in order to hold the mask firmly in place. This is fiber glass-free and latex-free. ASTM Level 3 masks have 160 mmHg fluid resistance, greater than 98% BFE, and greater than 98% PFE efficiency at 0.1 microns.