This is a general use face mask and is not intended for medical use. These masks should be disposed after each use | Masks feature 3 layers of filtration (3-Ply): 1 melt-blown polypropylene filtration layer surrounded by 2 non-woven spunbond waterproof fabric layers | Each mask comes with an adjustable nose clip and elastic ear loops to ensure a comfortable fit, The masks are hypoallergenic and glass fiber free | Box of 100 masks (contains two packs of 50 masks each)