Product Description: Smooth skin with Sothys NEW Hydra 4Ha Intensive Hydrating Serum. Recapture your youthful appearance with Sothys Hydra 4Ha Intensive Hydrating Serum. This serum provides deep hydration while improving elasticity. In addition to hyaluronic acid, this hydrating serum also includes a unique mushroom extract that boosts hyaluronic acid's moisturizing properties. When applied under other Sothys treatment creams, this serum helps increase hydration and supports the skin's natural functions. A highly effective formula to regenerate the skin and lastingly restore its moisture.