Good protection effec, made of high-efficiency electrostatic fiber, through the principle of electrostatic adsorption, the efficiency of filtering respirable dust is increased without increasing the resistance to breathing, and the safety and comfort are good * High adhesion, 3M protective mask designed according to face modeling, fits to the face, strong compactness, Protect your breathing and prevent particulate matter * Authoritative certification The 3M protective port is guaranteed by authoritative certification, ensuring your health * Contains electrostatic filter cotton, in line with US N95 standard, filtering efficiency for non-oily particles *Comfort version uses a non-rubber material to make the headband, which can be adjusted freely and light weight