Medtex M4 Fabric MaskSize: S Suitable for children or women with small faces, and those who find standard sizes too loose. Size: M Standard size, similar to a disposable surgical mask. Proven to filter 95% of 5 micron particles even without an added filter. Breathable thanks to its unique 3 layer muslin fabric structure from Medtex. Reduces dirt accumulation with its downward 3 pleat design. The outer layer is made from high quality COTTON USA fibers that are water
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