Mask is made of non-woven fabric for easy breathability. Soft and comfortable ear hook keeps it hold on your face without the need to adjust it when you work. A flexible Nose bar is adopted at the bridge of nose; The four sides of the marks join flatly and tightly to the face; Hence, it avoids unfiltered air directly entering into the disposable face masks and thus make breathe safely. USE : Three Masks a Day! Masks contain filters that prevent spray and pollutants from being spread. For hygiene reasons, use disposable masks and replace them when they get moist. Masks can only be worn for a maximum of four hours and it is best to change them regularly so they can remain effective.