Hi Carl
I have had my Ice Nino for 20 years now.
I have camped in temperatures of -4°C and slept comfortably.
What I do find is that a insulating sleeping mat makes a massive difference to shield you from the cold ground. We once went camping in Oudtshoorn and I forgot my sleeping mat, so slept on the tent floor and it was freezing! (min temp was probably 5-6°C, but it was also raining heavily)
As for zipping two sleeping bags together - it makes a HUGE difference - the body heat thing really works! So much so that you might want that airflow in from the neck to stop you from overheating!
Hope this helps!
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