This U.S. Military Heated Blanket uses the same chemical reaction as traditional heat packs. Expose it to air, and the reaction starts, slowly raising the temperature to a toasty 104AdegF. No electricity required. A great investment for camping, cold-weather hunting, ice fishing, emergency prepping and more. Starts working when exposed to air 104AdegF heat in 15-30 minutes Stays warm for up to 8 hours
