Our crew - three kids age seven to ten, and three adults - went out Saturday with temps -4 when we started. I was worried, esp about the kids, but we nailed it on clothes, chemical heaters. Near zero complaints. Still air and sun were big factors.
At the end of the day when we were tired (and it was 7F or 8F) we did get cold a bit.
At the end of the day when we were tired (and it was 7F or 8F) we did get cold a bit.