I think I have found my extreme weather system figured out. The last two days have been brutal hunting. Single digit to low teens with 20+ miles an hour wind. I had five layers on the top. Two layer merino wool long john top, a wind proof shirt, two ragg wool sweaters. The one will zip up like a turtle neck, and for an outer layer carhartt extreme arctic bibs and a Filson double mac cruiser. The filson has a big collar that comes up pretty high. I was as warm as could be. The only problem was the outfit was pretty bulky. However, I wasn't moving around too much, so everything was fine.