Yves Saint Laurent Rouge Pur Couture The Slim Lipstick is the lipstick that provides your lips with a 'mat leather' effect. Inspired by the color and suppleness of leather, Rouge Pur Couture The Slim instantly envelops the lips in a highly pigmented formula. Soft and creamy. The lipstick glides perfectly on the lips. Thanks to its square, slim design, Rouge Pur Couture The Slim ensures precise application and emphasizes the shape of the lips.