Ever notice how hard it is to do simple things with your hands when your fingers are cold? For example, striking a match: very difficult to do when your digits are freezing .
Here's your solution: hand warmers. Hand warmers are little packages of ingredients -- iron, water, cellulose, vermiculite, activated carbon and salt -- that, when exposed to the air, undergo a chemical reaction and heat up and stay hot for 11 to 12 hours. In fact, they can remain as hot as 135 to 155 degrees Fahrenheit (57 to 68 degrees Celsius). If you have mittens, you can stuff them inside your mittens to warm your hands up. Or, you can put the warmers in the bottom of your sleeping bag to keep your bed warm and cozy all night.