- Meltblown materials with block rate strong - This three-ply material is made up from a melt-blown material placed between non-woven fabric- Soft and reliable - not easy to drop, no need to adjust it when you work. A flexible Nose bar is adopted at the bridge of nose; The four sides join flatly and tightly to the face- Recommendations - Only be worn for a maximum of four hours and it is best to change them regularly so they can remain effective- Please wear it with nose clip on the upper side, and blue/green layer facing outside.- 3-Ply Breathable & Comfortable Filter Safety Mask- unique packing remains untouchable for any of the masks- elastic earloop