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As temperatures plummet, hands can go from uncomfortable to in danger of becoming frozen and frostbitten. Reusable hand warmers provide a way to protect your extremities while skiing, snowboarding, working outdoors, or simply walking long distances during your commute.

These hand warmers use a very simple chemical reaction process called exothermic crystallization. Within these heating pads for hands, you will see gel and metal discs. To initiate the warming process, all you need to do is bend(snap) the metal disc and knead the pad.

This allows a chemical chain reaction to begin throughout the gel of the hand warmer, which produces heat. You can see the crystals activate across the entire pack until the warmer becomes completely opaque. The warmer will then also, of course, radiate plenty of heat to keep hands comfortable. They work great when slipped into coat pockets or inside gloves to keep hands warm.

The heating pads become warm in a manner of seconds with the help of a bit of kneading. Holding one of the warmers in your hand is similar to warming your hands by holding a steaming cup of coffee.