THE NEW ALL HOURS FOUNDATION INFUSED WITH HYALURONIC ACID. 24H* FULL COVERAGE ; WEIGHTLESS FEEL. Complexion perfection you can rely on all day, all night, ALL HOURS. An upgraded breathable formula providing 24h* full coverage and weightless feel. For ALL HOURS renovation, YSL developed our first Skin-Fusing™ technology to mimic the composition of the skin for a total fusion. To achieve a triple proof: Transfer proof, Waterproof, and Sport proof.