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Ha, well I think it is working.
A friend of mine is a serious hill walker / amateur mountaineer and was saying most thermal hiking boots have some kind of foil footbed technology.
It makes sense in my head, similar to thermal sleeping pads making a huge difference when camping., so I folded a piece of extra strong foil into four layers, traced round the footbed, cut it out and slid them in.
Feet were not cold this morning. To really test it, think I need to take it out of one foot whilst keeping the other. Ideally i'd get the misses to do it and not tell me which one, just not sure I can face asking....
Is this a thing?