Im new to backpacking and i am trying to get all my gear ready for my first winter trip. I live and hike mostly in the southeast. I was wandering if these 100% wool survival blankets that i have seen at the army surpluse store are actually as warm as they claim to be. i was going to use this with a 20 degree sleeping bag becuase i cant really afford to buy a nice bag right now. if any of you have any experience with these blankets let me have your input. you guys would know better than i would.