I used to be obsessed with cooling eye masks. Every night I would go to bed wearing a sleeping mask with cooling gel insert. In addition during my ''pampering moments'' I used my other cooling mask. Then I stopped using them completely and noticed that my dark circles had a comeback. Also these masks keep my eye wrinkles at bay, or at least I think they do. Anyways, I'm back to using them. I bought the sleeping mask at a drugstore and wear it almost every night. The other one is Oriflame Pearl cooling eye mask and it's excellent when you want to treat your eyes and dark circles. I pop them in the freezer for couple of minutes (on the instructions it says that you should put them in refrigerator for couple of hours, not in freezer, but it's so much faster this way) and they are ready for use.