Yves Saint Laurent All Hours Foundation is a liquid foundation that provides full coverage with a natural matte finish. It is available in a range of shades and contains ingredients such as water, cyclohexasiloxane, alcohol denat, isododecane, and hyaluronic acid. The foundation is free of oils and parabens, but it contains alcohol, silicon, and fragrance. Some users have reported that the foundation can be drying and settle into fine lines, while others have praised its long-lasting wear and coverage.