Since new variants of COVID-19 are even more contagious, it's important to wear masks with a high filtration capacity and a snug fit. N95 and KN95 masks best fit that bill.

N95 and KN95 masks are held to different standards, though, so you need to be careful in deciding which is right for you.

These masks can filter a higher percent of particles in the air than surgical masks or homemade cloth face coverings.

But what exactly are N95 and KN95 masks, what are the differences between them, and which mask should you ultimately purchase? 

Here's what the science says—and which one is right for you. Read the Popular Mechanics article here.