Cosrx Hydium Watery Tones are a moisturizing and soothing tone formulated with panthenol, allantoin and 6 types of hyaluronic acid. The 6 types of hyaluronic acid are of small, medium and large molecules that are easily absorbed by the skin. The different molecular size hydrate the skin on the surface and the smaller molecycles workers lightly in deeper layers. Hyaluronic acid acts as a water reservoir as it holds 1000 times its own weight in water. Panthenol also known as vitamin B5, is moisturizing, regenerating and has anti-inflammatory properties. The notes leave the skin delightful, hydrated and moistened.