What it is: A multi-purpose, silky-smooth formula that keeps eye color in place. What it does: It leaves your eyes with a matte, natural finish and perfectly primed to help your favorite Lancome shadows last even longer. How to use: Blend onto eyelids with a concealer brush or your ring finger before applying eyeshadow and liner. Style Name: Lancome Aquatique Waterproof Eye Color Base. Style Number: 10099U. Available in stores.