Koh Gen Do’s Pure Cotton cloths are not a sheet mask, they are the perfect material with which to make your own. This tip comes courtesy of Danuta Mieloch, owner and head esthetician at super-trendy Rescue Spa. Simply drench a few sheets in your favorite serum, layer them on your face, wait 10 to 15 minutes, and voilà! You’ve hacked the sheet mask. –mindbodygreen