This is a 2 layer Non-Structured (no thicker lining)  with a poly top and100% cotton backing face mask.  It is designed without a pocket for the use of a filter, but can accommodate one the inside of the mask.
 
Material: Polyester, 100% cotton, elastic
 
Disclaimer: These handmade masks are not meant to stop any virus. Please be cautious when adding filters, making sure that you are able to breathe properly in the mask.