My lowest temperature is 91.1
My highest temperature 95.1
and the range is 4.
The material we used were wool, felt, and quilt. We chose all of our materials because we thought they were the best insulators.
We didn't use the fur bag, plastic wrap, foil, we didn't use them because they didn't sound like good insulators.
A insulator is a bad conductor of heat energy because an insulator doesn't let it pass by that's why it is a good insulator.