Chris Kavanaugh wrote -

Mors Kochanski www.customwoolenmills.com ( nice folks to deal with too) The boot suggestions are excellent, but for extreme cold this sock example demonstrates the need for extreme footwear in the form of Mucluks. I own Stegners from Minnesota, easilly folded up with socks, they are invaluable. Winter boots were a key item the Soviet authorities reminded people to keep for future retreats during WW2

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Could you expand on this? I went to the site, but didn't see anything about mucluks. In what way do they take the place of or supplement boots?