Rather than leap to what I do I'll offer a book that explains why you get cold and how to prevent it. Knowing the WHY is very important - and that's part of what these forums are all about.

COLD COMFORT by Glenn Randall. It's not a new book but 20 years ago it revolutionized my ability to stay warm while camping here in Colorado.
Talks about the fact that our bodies transpire moisture thru the skin which then affects our insulation layers. Different insulating materials and techniques can be applied to handle each situation (heavy activity vs no activity)


Unimogbert