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, medical 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