Despite the above-zero temps and rather brave appearance of two spring bulbs poking above the soil in the warmest bit of our front garden, I know winter’s just teasing us and isn’t about to go away just yet. So: I recommend these reusable instant hand warmers from Lee Valley (of course).
It is, as it says, a pouch of clear liquid containing a small metal disk. When you flex the disk it creates an exothermic reaction that turns the whole pouch into a big blogck of salt which stays warm for half an hour or so. You recharge it by boiling it for a few minutes*. I have found they’re quite sensitive and have set mine off by accident a couple of times, but aside from that quirk they’re an extremely handy thing to have in an inside jacket pocket on a cold day.
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* “Do not microwave”, says the package. Yeah, that would be a mess.