SOOMLAB's Hyper Purifying Breathing Mask is a high quality premium face mask. Made and imported from Korea. This mask is applied cutting edge BEYONDTEX technology so that you can breathe much easier. Our 10 pack large black moisture resistant disposable face masks are reusable up to 10 cleanings without compromising filtration. Nano-fiber is much finer than electrostatic (Melt Blown) filter, which allows for Higher filtration. Hyper Purifying Breathing Face Mask Nano fiber is larger than air but smaller than noxious airborne particles. It is a perfect filter for both filtration and durability with maximum comfort for everyday use. Sterilize with 75% ethanol for multiple use. Fully and completely dry mask before reuse.