Neutriherbs Hyaluronic Acid Mask leverages 4D-Hyaluronic Acid, a combination of four kinds of hyaluronic acid with different properties, to build up and form a three-dimensional network which accurately targets the different layers of the skin, to hydrate the skin from the outside and hold water from within. In this way the skin is moisturized and hydrated completely and improves in elasticity directly from within, making the skin smooth and elastic.