*Efficient Protection                    
*Two types of the package will be delivered according to stock        
*HAVE TO CHANGE EVERY 48 HOURS    
*Earloop type 
*4 ply:4 layers filtration: The first layer is white soft non-woven, the second layer is hot air through non-woven, the third layer is meltblown non-woven and the fourth layer is white soft non-woven.    
*Breathable and comfortable