RE: Are there any good handwarmers?
You obviously are doing something wrong. If you look on the pack before you open them you'll find a use by date. If yours are old they won't work well. I've found they usually loose a lot within the last year of the "Use by" date. That said, as someone mentioned, they have to breath. You have to wiggle your toes to move air. I've found they stay warm for a LONG time. 4 or 5 hours is no problem. Perhaps you're expecting a toe warmer to keep the rest of your body warm. I don't use the things unless it's REALLY cold. They do create hot spots and can cause other areas to feel colder. If your boots are too tight, they won't work well. If you don't move your toes to cause air to move... they won't feel warm. I've tried several different kinds and they all work.