Hand Warmers: 5 Fast Facts

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Fact #1. Hand warmers fall into three main categories. The first is those that use a chemical reaction to produce heat. These have one major benefit over their counterparts: they're always ready to snap into action. They don't need a charge from an electrical outlet or fuel-filled reservoir.
Fact #2. The second category of hand warmers are those that use an electric battery. Once charged, they produce heat literally at the flick of a switch or push of a button. This alleviates any confusion that might be caused by activating chemically reactive warmers. It also removes the unease some people feel around fuel-burning units.
Fact #3. The third and final category of hand warmers are those that use an actual self-contained fuel burner. These have been a mainstay of outdoorsmen and hunters for generations. They can provide hours upon hours of heat. Their function is limited only by the supply of fuel you have on hand.
Fact #4. When your hands are cold enough to tingle or hurt, the situation might not be simply unpleasant. It might be downright dangerous. Frostbite is the name given to the exceptionally unpleasant situation in which the flesh actually becomes frozen. When the temperature is low enough, frostbite can occur in less than ten minutes. The indications you might be at risk for frostbite start with tingling and redness. These symptoms are signs that you must immediately move into a warmer environment or directly warm the afflicted body parts.
Fact #5. Warming up those frigid fingers is critical to preventing potentially serious, long-term injuries. However, make sure you bring them back to warmth with care. Cold fingers are at increased risk for injury caused by a cut, a puncture, and a burn. That's because nerves that usually respond quickly to sensations of pain or heat are less receptive when your hands are cold.