Because it's a gel, it feels cool and adheres well, making it very easy to use. When I leave it on for about 15 minutes and take it off, I can feel a bit of moisture, a slight cooling sensation, and a sense that the area around my eyes is subtly brightened. I really like the sensation of not just being filled with moisture, but also feeling nourished and enriched with vitamin C. I've heard about it, and it's true.