The boots I have were a half size too big. I thought maybe extra insoles would make them warmer. Nope, have to wear 2 pairs of socksFor those with boots that don't keep your feet warm, try getting a size or two larger if you're going to wear thicker/heavier socks. If the insulation gets compacted you end up losing the layer of air trapping space the insulation is supposed to provide. Think of it like your house, if you flatten all of your insulation the place will get cold. That's why the insulation has a lot of air space in it.
Good morning Mo, have a great day
hoping spring isn't a month late