For those of us whose hands and feet are the first to go numb with cold as the temperature drops, this is quite possibly the best invention since the sock. When gloves just aren't enough, just open up one of these packets, shake, and keep in your pockets so that when you stick your hands in there to warm up, they do so in a hurry. The contents are air-activated, and then maintain a cozy temperature for several hours if within a confined space - but not so hot as to burn. Do not let young kids use, however. Absolutely great to have on cold weather backpacking trips. Another great use is to throw one in the sleeping bag you rent from us to add several degrees of warmth to your bag's temperature rating.
Price above is for a pack of 3 pair, or an equivalent number (6) of singles.