Toe warmers and thin wool socks. I tried a variety of “winter wool” cycling socks and no joy. I dropped $50 on neopreme – no joy (but you should have seen the sweat). Toe warmers – perfect!
Now that it is Spring… things are easier… just need to stay hydrated during training as there are no rest stops. At least during the MS 150 this April there are stops every 10-15 miles.