However, the researchers and other experts say there’s a big caveat: If your mask leaks around the edges, unlike the tightly fitted N95, your homemade filter will lose its effectiveness.

It shouldn't be worn without one. HEPA filters: Dr. Cassoobhoy warns that, if you want to use a HEPA filter with your fabric face mask, you should do your research first.

T-Shirt Mask (No Sew) Image: CDC This mask only requires a T-shirt and scissors. At the bottom of the T-shirt, cut a 7- to 8-inch-tall band Cut out a rectangle roughly 6 to 7 inches in length and ...

A normal mask needs a filter to clean the air and a seal to ensure no bad air comes in. But there’s a problem with the seal if you have any facial hair or sweat.