I have given this some thought for a while, and I mentioned it in passing in a post some weeks ago, but it did not generate a response.
The last time I was out, when it was well below 40°, my feet were quite cold. I was wearing socks and was in a 25° bag with a hot water bottle. Overall I was toasty, but my feet were cold. After I gave it some thought, I realized that my feet were elevated a few inches which probably reduced blood flow, and warmth.
Is this a realistic conclusion? If so, what can be done about it? I have another hike in just over a week, probably in similar temps. Any guess how I can defeat the CFS (cold feet syndrome)?