Marine.Seaweed. When I hear these words in skincare - I think hydration. And yes, this one hydrates and moisturizes well for me. Goes to my bedtime routine because the texture is rich and thick. Spreads smoothly on skin and feels luxurious to use. Give it a minute to fully absorb. Its also great that it comes with a metaleye applicator that doubles as a nice massager. Helps cool down my puffy eyes.