The first thing you'll notice when you have this mask on is the cooling sensation. I have pretty sensitive skin, and usually things that are supposed to cool actually kind of sting, but this doesn't! It cools so much that it actually feels kind of numbing, which is a nice break from the pain caused by my hormonal acne attacks. It has just the slightest fresh, botanical smell, which adds to the totally luxurious experience. There was enough of the serum left in the package to apply it for a few more days.