Study: Proper fit crucial for masks to work, even when wearing two By (0) While a variety of masks can help prevent spread of COVID-19, a snug fit is key -- whether wearing one or two masks -- according to new research. File Photo by John Angelillo/UPI | License Photo While a variety of masks can help prevent spread of COVID-19, a snug fit is key -- whether wearing one or two masks -- according to new research. File Photo by John Angelillo/UPI | License Photo While a variety of masks can help prevent spread of COVID-19, a snug fit is key -- whether wearing one or two masks -- according to new research. File Photo by John Angelillo/UPI | License Photo