A: The masks themselves are made up of four layers of 100% cotton material. Base outer layer (colored), inner filtration layer, inner finishing layer (white), then the filter pocket and finally the soft facial contact layer.
The PM2.5 filter adds an additional five non-woven layers to the mask including a layer of "activated carbon" to filter out most airborne particles.
The masks may be used with or without the filter.
Origin information is in the "Product Information Tab"