Keep your feet and socks as dry as possible.
Rotate socks frequently (We carried another pair under our shirts to dry as one pair is worn).
Don't lace too tight. Let your blood circulate.
Wear Gators when possible to add more insulation to your boot tops and ankles.
Use the combination of two pairs of socks at a time (layer over feet is thin polypropylene while the outer layer is thicker wool).
Every hour or so check your feet while doing your sock-change to massage your feet and get more circulation moving.
Some guys like to use foot powder in combination to the tips above.
I'm sure other winter-warriors here have more advice than I.
Good luck.
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