Yves Saint Laurent Beaute Couture Liquid Eyeliner DetailsIntroducing YSL's new liquid liner, Couture Eyeliner. The extra slim felt tip allows you to draw the perfect line, every time. Its smudgeproof, long-wear formula glides onto the lid with high color intensity, leaving a flawless matte finish that is smooth and fast drying. Enriched with a triple lash growth complex, Couture Eyeliner nourishes and strengthens lashes giving you care and comfort with every application. Designer About Yves S.