'' Sales of face masks are up, largely thanks to the Korean beauty invasion which has now brought us sheet masks. Genius, not least because they're not exposed to oxygen or light prior to use, which can degrate ingredients, says dermatologist Dr. Justine Hextall . Also, a barrier still prevents water evaporating and increases temperature, which helps absorption. But I'll cost you. WH's Beauty Editor Amelia Jean Jones makes sure your money is well spent. [...]'' Click on the photo to read full article in Women's Health Magazine.