AdvertisementAdding A Nylon Stocking Layer Could Boost Protection From Cloth Masks, Study FindsApril 22, 2020Maria GodoyfacebookEmailResearcher Loretta Fernandez of Northeastern University wears a homemade face mask without and with an extra outer layer made from nylon stockings (right). The added nylon outer layer significantly boosted masks' ability to filter out small particles, her research found. (Loretta Fernandez)