My father taught me a wonderful trick with those heat packs that are to warm your hands. Knowing this has allowed always cold me to go ice climbing & camping without shivering for hours!
Activate the heat pack, & put 2 sided tape on it. Put one in each under arm. Having heat there stimulates blood vessels, & helps you generate body heat. This is awesome since sometimes I think I don't generate any body heat myself. Just putting them on your hands gets them warmer where the pad is touching, but putting them under your arms helps all over.
A couple safety notes: putting them on your skin may cause burns. Ideally a thin layer of clothing between the pad & your skin is wanted. I don't always have this, & did get burned once.
Also, don't use duct tape to attach it if you can help it! Very hard to get the pads off, & it leaves a lot of residue!
We've also considered sewing pockets into a warm shirt to hold these.
Now this is cheap & effective! Usually the pads stay warm for about 6 hours. When I've slept with them, even after they run out, by then the sleeping bag is warm & so I'm warm while I'm in the bag. Now it would be hard to store enough for an entire winter, but I do have a pile of these around for a short term emergency. Not to mention all my cold outdoor outings! Or for prep storage, there are some with longer warming time; up to 20 hours.
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