I forgot to mention this above, what do you plan to put on your feet while cycling? While camping?

Do you know the symptoms to look for in case of frostbite?

Cycle shoes - I have a normal summer pair that are a larger size so that I can wear heavy wool socks. And I use a pair of toe covers to cover and seal off the venting mesh. This still is the part of me that gets coldest, even with heavy wool socks and toe covers. I have to be very careful that I do not step in a puddle, it only takes milliseconds for icy cold water to flow into the holes in the soles for cleat attachment hardware. If I was going to actually do winter touring where I would be many miles from a warm indoors, I would consider wearing normal hiking boots on platform pedals.

Around the campsite - this is pretty basic stuff that if you do not know what to wear, maybe you should not try it.