Score!

I bought a pair of these for up there...

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I can't help with your main question, but I will be bringing my Kenetrek Northern Pac Boots, in addition to muck boots. Worse case, you can borrow my packs unless size 9 is too small. When paired with some heavy socks, my Arctic Sport muck boots have served me well when it is well below -20. They're not bad for somewhat short hikes either.