These are really nice for headaches.  I love to plaster one on my forehead anytime I get a headache.  They're not sticky enough to be able to wonder around with them on, but lets face it with a headache bad enough to warrant a cold patch who wants to be up running around?  If you want to use a second one after the first one looses it's oomph you'll want to wash your forehead with soap and water between them to insure the second one sticks well.