I haven't stopped using the eyebrow pencil since — which was one month ago —and I dare to call it my newest holy grail item, especially for summer. With its waterproof and smudge-proof formula , I've put it to the test at an outdoor electronic concert that involved lots of jumping up and down, during a New York City heat advisory that had my foundation melting off, and even a quick dip in the pool in humid Miami. Yes, my eyebrows have stayed intact through it all.