ISNTREE - Hyaluronic Acid Water Sleeping MaskHyaluronic Acid can hold up to 1000 times its weight in water, and this sleeping pack contains 5 different kinds of Hyaluronic Acid, including high, medium, and low molecular weights to deeply hydrate every layer of the skin, resulting in plump, healthy looking skin. The inclusion of NMF (Natural Moisturising Factors), which consists of amino acids, ceramides, and fatty acids, helps to form the building blocks to maintain a healthy skin barrier.