Very good product ! I have headaches very often, and I've owned a freezing headband for a certain time now (the ones with little jelly balls in it), one that goes on your forehead only. The problem with it was that it unfroze too quickly, and I often was left with a part of my head still hurting (the back, for exemple).
With this one, the whole head is cooled down, even the eyes when you happen to have a migraine ! I can say that for me, it is much more effective ! I am even seriously considering buying a second one, just for the rare times I have a migraine and the first one isn't enough.