16:12
Experts say N95 masks are more effective protection against Delta variant
With the Delta variant being much more transmissible than previous variants, some experts have said we should try upgrading our face masks.
"Delta is so contagious that when we talk about masks, I don't think we should just talk about masks," said Scott Gottlieb, former commissioner of the US Food and Drug Administration, in an interview with CBS.
Linsey Marr, an aerosol expert at Virginia Tech, told The Washington Post that "where a simple cloth mask was helpful before, it's not helpful enough now".
The woven material used in many cloth masks is not as effective at filtering particles as that used to make surgical masks and respirators, Ms Marr said.
While surgical masks are more effective, the N95 respirators can add even more protection as they are designed to fit snugly to the face.
"A surgical mask is just a rectangle and you're trying to pull it to your face," Ms Marr said. "Obviously, our faces aren't in the shape of a flat rectangle, so you inevitably end up with lots of leaks."