What’s the deal with face masks?

There are clay masks, which purport to pull out toxins (and we can personally attest are an effective overnight spot treatment for a stubborn zit). Then there are black masks, which tear out blackheads (disclaimer: potentially painful). And then there are sheet masks, the tallest flagpole for the Korean beauty invasion that’s been sweeping North America. Essentially serum-soaked cotton sheets with eye and mouth cutouts, this Jason-esque treatment offers intense hydration. The sopping layer allows the formula to soak in without evaporating off your skin.