Ensuring you stay warm in the most extreme temperatures, the Everest Down Extreme Sleeping bag is our most advanced sleeping bag. The comfort temperature is -3°C to - 9°C with a mummy shape to match your body shape, making it ideal for camping during chilly nights. Comfort Temperature - The comfort temperature for this sleeping bag is -3°C to -9°C. This is the minimum temperature that the sleeping bag is designed forExtreme Rating - can be used for extreme temperature of -36°C. This is a survival temperature only. The bag is not intended for regular use at this temperatureHood - Much of your body heat is lost through your head, a shaped hood will help keep in heat. A draw cord closure allows you to pull the hood tight against your face for added warmth. Personal Preference - Please remember that everyone feels the hot and cold differently. Always go with your personal preference Great for sub-zero conditions - it\\\'s ideal for cold temperature expeditions