Turn your regular mascara into a smudge free, waterproof mascara with NYX Professional Makeup Proof It! Waterproof Mascara Top Coat. Also suitable for brows, the clear formula is applied over your mascara to become long-wearing, run-proof, smudge-resistant and waterproof. Perfect for days in the sunshine, in the water, playing sports or when the weather is less than reliable, with Proof It! on your lashes you can be sure your mascara will not budge.