The term '3D hyaluronic acid' refers to the use of hyaluronic acid in multiple forms or structures within the formula. Hyaluronic acid is a moisture-binding substance that helps attract and hold water in the upper layers of the skin. As described for this mask, using different forms creates a more layered hydrating effect where some moisture remains nearer the skin's surface to provide immediate smoothness and a plumper look, while other fractions work to improve the feeling of skin elasticity. This approach is common in cosmetics aiming for multi-depth hydration. It does not refer to a literal three-dimensional shape, but rather to the concept of delivering hydration at different levels within the skin's surface layers for a more comprehensive effect.