This is a great product! It simply does what it says. It gives you a very cool sensation to whatever area of skin you apply it. It stays cool for many hours. It also attaches securely to your skin, but, when removed, leaves no sticky residue behind. I've only tried it once, so far, but it brought on a very comforting feeling. It may not completely fix a migraine, but it does a lot more than medications alone can do. I didn't expect it to live up to the praises most of the reviews I had read about it claimed, but it I was proven wrong. It completely surpassed my expectations, even the most positive hopes I had for it! I think these are good for a lot more than just migraines. Great product for head/neck pain, and it even provides a psychological comfort as well. I will definitely purchase again!