30 Filters (3 Pack) HEPA11 Face Mask Refill Filter Inserts, Made in Korea
- The first layer is made out of non woven fabric which doesn't have small holes like woven material..
- The second layer is made out of melt blown fabric which helps with filter, repel water and liquids, cushioning, strength and is washable..
- The third layer is made with activated carbon fabric that is widely used in industrial and defense applications..
- The fourth layer is another layer of melt blown fabric which sandwiches the activated charcoal layer in the middle for maximum filtration efficiency..
- The fifth layer is another layer of non woven fabric. Please note that this material is made out of high efficiency non-woven fabric that allows for better air circulation and is skin friendly..