liner socks are one of the most important things, along with oversize boots so there is room for air so to speak. IIRC my winter boots are at least 1 if not 2 sizes larger than normal.
Good liner sock, and then good wool sock, sometimes a really heavy wool sock but if the boot isn't so loose that i almost can't kick if off, its too tight and won't keep my foot warm.
Toe warmers are never bad to have in the pack either.
