Steve Vai
Endurance Guy: Tolerates most of us.
Don’t take my word for it... ask for JP’s thoughts.
This is the set-up he used to go to Nome last year. You can't see it in the pic but it does have reflective material on top of the pad, as does the inside of the Bivy. In the Hypothermia Course I'm taking they go over this quite a bit and it seems like once you're in a sleeping bag very little heat actually gets through to the pad and reflected back. I forget the number but it was something like a 2 or 3 degree increase.