These masks contain two nano-layers between their protective spun-bond layers. They have an efficiency of about 99% in trapping particles of 0.3 microns, and this pressure drop is slightly lower than other masks (which makes breathing easier).
These masks contain a nano layer between their protective spunbond layers. The 0.1 micron particle trapping efficiency of these masks is about 99% and the pressure drop is small (easier to breathe than other masks). The smaller size of this mask is suitable for 10 to 18 year olds (teenagers or women with thin and small faces) and makes the mask more fixed on the face.