Forget the temperature range that is purely theoretical and I mean soliciting - mean -6 degrees that you survived the night (according to the official classification). Also, I had no idea at the beginning and rely on these figures. At 11 degrees you really have to tidy clothes to wear comfortable to sleep in. It took me so many sleeping in different regions and at sub-zero temperatures (and even some "winter sleeping bags are only suitable for the summer) and this is definitely not for the winter, suitable temperatures to zero. Compared to other well-known brands to get with this but the best and cheapest way. Very well made, very light and small pack size.