On expeditions in extreme conditions managing moisture is half the job. I read an interview with Børge Ousland (polar explorer, crossed the north pole in winter

On expeditions in extreme conditions managing moisture is half the job. I read an interview with Børge Ousland (polar explorer, crossed the north pole in winter conditions on ski in 2019) about how he plans and executes expeditions. He use a thin wool sock, then a plastic bag(!), then a thick wool sock (or several wool socks) inside his shoes. So the inner sock will be wet by sweat, but the plastic bag stops the moisture so the thick wool sock and shoes are kept dry. Then at night he can dry the thin wool sock by keeping it close to his body. He also sleeps in a plastic bag inside the sleeping bag to keep moisture out of the sleeping bag. It's quite interesting how these extreme expeditions work. They have to spend much of the time in the tent brushing ice off clothes, shoes, the tent itself, equipment and so on, because if the ice melts it will freeze again and shit will get ruined.