Hyaluronic acid (HA) is a humectant that binds water. Its molecule size determines how deeply it can penetrate. This mask uses a blend of three sizes for a multi‑layer hydrating effect. Larger HA molecules remain on the skin's surface, forming a hydrating film that immediately alleviates the feeling of tightness and creates a smooth, plumped canvas. Medium‑sized molecules penetrate slightly into the upper layers of the epidermis, helping to improve medium‑term hydration. The smallest molecules can reach deeper into the skin's upper layers, providing hydration at a cellular level and helping to improve the look of fine lines caused by dehydration. This combination is why the mask is described as suitable for skin that feels rough or dull – it addresses surface dryness while also delivering hydration to where it's needed. The effect is cosmetic hydration; it does not permanently alter skin structure or medical dryness conditions.