The COSRX The Hyaluronic Acid 3 Serum is a lightweight, multi-layered hydration serum designed to deliver intense moisture deep into the skin. Formulated with three types of Hyaluronic Acid (High, Medium, and Low Molecular Weight), it penetrates various layers of the skin to provide long-lasting hydration, improve elasticity, and leave the skin soft, plump, and refreshed. Perfect for all skin types, especially dry and dehydrated skin.