+1 on the ice breakers. I have hunted in an ice storm one year. My feet never got cold.
My Tips.
1. Just wear regular socks.
2. Not too snug of boots. Toes need to move.
3. Put them on as soon as you get to your stand.
Remember: They save heat from leaving your boots. They DON'T create heat.
If your feet do get cold, Take them off, take a short walk, put them back on.
Robb