Which Sleeping Bag Should I Buy -

Experts at REI suggest adding a 10–15°F buffer to the coldest temperature you expect to ensure you stay warm. 3. Choose the Insulation Material Sleeping Bag Temperature Ratings Guide | REI Expert Advice

How you plan to transport your gear significantly influences your choice: which sleeping bag should i buy

The temperature at which a "warm sleeper" (typically the average man) can sleep comfortably in a curled position. Experts at REI suggest adding a 10–15°F buffer

A survival-only rating indicating the minimum temperature to avoid hypothermia; it is not for planned use. it is not for planned use.