Happyface masks have several unique properties. One such special property of the Happyface fabric is an application called Chitosan. The chitosan is used as an application on the surface of the fabric used to make Happyface masks. Chitosan is naturally non-toxic, biodegradable, and biocompatible. The application used on the Happyface fabrics is EPA certified. This application makes the fabric anti-microbial, which keeps your mask odor-free, bacteria-free, mold-free, and will prevent skin-blemishes.