For those of you that have expressed interest in the R-12 award, here is a link that you may find useful: 

Cyclist Bob Shay - 10 years - 20,000 Miles - With Hotronic FootWarmers

They are a bit pricey but they apparently work very well. I think they are mostly for skiers but can also be used on a bike.

Personally my weak point when the weather is below 30F is my feet, I have been able to keep comfortable everywhere else.

Eric Peterson