* doesn't want to spend the money on an electric vest
or
* doesn't want to chance an electric vest on their charging system
or
* wants less bulk than an electric vest to carry around
Take the ugliest old t-shirt you have. Tear off the sleeves; then sew them or have them sewn onto the front of the shirt as pockets. Put one over the chest and one over the gut.
Go to an outdoor store or department and get the little heat packs sold to hunters and campers. When you open the package and expose them to air they generate heat for a period of several hours depending upon their size.
When I am taking a trip that could encounter some cold I slip this on over my regular tshirt. Then if the temprature drops as in after sundown I open a couple of the packs and slip them into the pockets.
It works well because it puts heat directly on the core of the body. When you are in the cold the body pulls blood from the extremeties to cover the vital organs in the core. You must keep the core warm to keep the fingers and toes warm.
The whole setup is small enough to fit in a large jacket pocket.
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