Re: Keeping Your Feet Warm
Someone else mentioned about the importance of an air pocket around your feet & boot. I will echo that based on my experience, I fish all year around and used to wear a polypro liner sock + wool hiker pair inside my stocking foot waders (inside the wading boots).
I would routinely get very cold feet & was getting frustrated when after reading about winter hiking in some of the outdoor forums, I decided to try wearing just the wool hiker socks (one pair). Surprisingly this resolved my problem and I rarely get cold feet anymore.
If you prefer wearing the liner + wool sock combo, go with a larger sized boot. This will allow you to still maintain a layer of air (warmed from body heat) between your sock'd foot and the boot.