I doubt you will need too much insulation in your boots unless you will be spending a lot of time outdoors in very cold weather being inactive.
If you are moving about, the blood will flow more, keeping your feet warm. Wearing good long underwear will warm your feet more than insulated boots, as they keep the legs warm, and so the blood flowing to your feet keeps its warmth rather than dissipating it to re-warm the legs.
Be there or be square. Only I can do both!
I've got a cat named Beefeater and a dog named Beefeater, and two goldfish called Beefeater and Beefeater. There's Beefeater my hamster and Beefeater my horse, and my piglet, known as Beefeater of course.
Veteran of the Great Irisch Moos Campaign of 2008-09