Choose a bag with a rating 10–15°F lower than the coldest temperature you expect to encounter. 2. Choosing Insulation: Down vs. Synthetic
A survival-only rating indicating the temperature at which a standard woman can survive for six hours without hypothermia; it is not a comfort guide. how to buy a sleeping bag
The temperature at which a "standard woman" (or cold sleeper) can sleep comfortably in a relaxed position. Choose a bag with a rating 10–15°F lower