When they say waterproof they mean waterproof, after an entire day with this, when I washed my face It wouldn't come off. Had to remove it with make up remover and for me that's a good thing as it means that even when I go swimming I can have stunning lashes. Stila has used an amazing brush with this mascara, it's a triangular 3D brush which ensures definition and length. It doesn't flake at all and won't smudge even when wet. And to top it off Stila have added coconut oil and mango butter to make nourish our lashes leaving them soft, smooth, shiny and protected, Stila understands a woman's needs