When I'm out fatbiking, I use a pair of hiking boots with Gortex, and I'm good for several hours, still chilly, but they're the best cold weather shoe I use, but they're only good for flat pedals.. You could always go with a pair of 45NRTH Wolfgar or Wolvhammer, the fatbike crowd love both of those, and they're SPD compatible.
Funny you should mention that, these were featured in a bikerumor article, https://www.flambeauoutdoors.com/Heated-Gear/SocksI asked for them for x-mas, but no bites... I'll pick some up, and report back. Cheers,Greg
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