Whether your eyelashes struggle to hold a curl or you simply need a smudge-proof formula, it’s best to look for waterproof or water-resistant mascara formulas. While both serve as a water-repellant and will prevent pigment from streaming down your face, there are some differences to consider when picking out your everyday mascara. To help you decide if a waterproof or water-resistant formula is right for your lashes, we spoke with celebrity makeup artist Nina Soriano.