"but with feet, what can you do?"

Amundsen confesses a similar problem with feet:

most important is the covering of the feet, for the feet are the most exposed members and the most difficult to protect. One can look after the hands; if they are cold it is easy to beat them into warmth again. Not so with the feet; they are covered up in the morning, and this is sufficiently troublesome piece of work to make one disinclined to undo it again until one is turning in. They cannot be seen in the course of the day, and one has to depend entirely on feeling; but feeling in this case often plays curious tricks. How often has it happened that men have had their feet frozen without knowing it! For had they known it, they could not possibly have let it go so far. The fact is that in this case sensation is a somewhat doubtful guide, for the feet lose all sensation. It is true that there is a transitional stage, when one feels the cold smarting in one’s toes, and tries to get rid of it by stamping the feet. As a rule this is successful; the warmth returns, or the circulation is restored; but occasionally it happens that sensation is lost at the very moment when those precautions are taken. And then one must be an old hand to know what has happened. Many men conclude that, as they no longer feel the unpleasant smarting sensation, all is well; and at the evening inspection a frozen foot of tallow-like appearance presents itself. An event of this kind may ruin the most elaborately prepared enterprise, and it is therefore advisable in the matter of feet to carry ones’ caution to lengths which may seem ridiculous.