So here is my foot wear setup. I start with one of the 3 base layers, either the super thin Bridgedale liner, a thin Icebreaker sock or sometimes the thicker Smartwool sock, then I use a RBH design vapor barrier, this prevents my insulating sock, which is the Wigwam El-Pine sock, from getting wet. My boots are RU outside Tundra boots which they no longer make-boooo! They have been seamed sealed several times and got a fresh coat just before we left. The replaceable liner, which I did replace this yr, in the boot insulates as well as reflects heat back to the foot. I use the PolarWrap Toasty Feet insole, made to regulate the temperature of the foot, made with aerogel, which is comfortable to me. My feet did get cold just a couple times, probably lack of circulation, but I got off and ran and they warmed right up. I also put hand warmers on my shines which are held there by my socks and around my knees which are held there by my OR gaitors and pants. Due to the colder temps last year, I do believe I did some damage to my toes, cuz it was 3 months before I could flick my shoes off with my toes. I didn't experience that this year with the warmer temps.
Last year I used the thicker Smartwool sock b/c it was much colder goin' to Nome. This yr I used the thin Bridgedale sock to McGrath and the Icebreaker sock goin' to Nome. I did get some rubbin' on the inside of my heel which caused blisters, not shure if it was the holes in the Icebreaker sock, the new vapor barrier sock or the new boot liner, could have been a combination. I also use Aquaphor ointment on my feet, face, hands and a$$. It's one thing that covers it all.
I did step in some overflow and it was approx and hour before it soaked thru to my foot, by which time we were in a safety cabin drying out. Had that cabin not been there, I would have had to stop, make a fire to dry my boots and change my socks. I carry and extra liner sock and wigwam sock for emergency. I also have screws drilled into the bottom of my shoes for traction on the ice.Frozen overflow leaving Ophir on the way to Iditarod. Now while this setup may work for me, it is highly recommended YOU figure out and TEST what works for you! Til next time!