Eucerin Face Immersive Hydration Moisture Boost Serum provides 24-hour hydration and immediately smoother skin. The clinically proven formula is enriched with two sizes of 3x-concentrated* Multi-Weight Hyaluronic Acid. It hydrates the skin's surface plus its upper surface layers. Skin feels fresh, hydrated, and is immediately visibly smoother. The ultra-lightweight hyaluronic acid serum won't clog pores, and is suitable for all skin types, even sensitive skin.