Yaktrax hand warmers are a safe, easy and completely natural solution for cold hands. Once opened and exposed to the oxygen in the air, these disposable yet environmentally friendly heaters start running in minutes. Slip them into a pair of gloves or jacket pockets and create a comfortable hand cocoon that lasts up to 8 hours. Yaktrax heaters are the ideal choice for sportsmen, winter athletes, spectators and anyone who works or plays outdoors.

How does it work:
When exposed to oxygen in the air, the iron filings inside the bag begin to oxidize creating a rapid rusting process which in turn produces residual heat. The salt acts as a catalyst, while the carbon helps disperse the heat evenly. Vermiculite acts as an insulator that helps prevent heat from dissipating too quickly.