Answer:
How much clothing do you like to wear when you sleep? ... (At this time winter bags, rated to 0°F or below, can't be tested accurately using available equipment.) ... underwear and a hat is placed in the sleeping bag, which is set atop a sleeping pad in a climate-controlled chamber. ... This is a rating for a true emergency situation, not an enjoyable backpacking trip. ... for summer backpacking even though the temperature almost never dipped below freezing, and she was rarely too warm.
