Well, this is the first sleep system that I have ever owned.
It is amazing and truly different from a "sleeping Bag".
Comfortable and warm.
I am going to put it to the test in November , on a hunting trip.
We will see if it can keep these old bones warm.
BTW, I used this bag , on a 60 degree night and it was warm but NOT too warm... How does it know ????
This review was written in the old system and had content requirements that are different than reviews written today.