Took eleven scouts away camping for the weekend. They slept in tents - the leaders slept in hammocks. We all have DD camping hammocks and DD Tarp setups, fairly simple, no underblankets, just roll mats stuffed in between the two layers. We all had decent sleeping bags - I bought a mountain hardwear lamina cause I knew it was gonna be cold. The first night was cold, about -5, but the second night as colder at -11. All of us were fine in our bags with roll mats. A couple of cold spots around the shoulders and lower back but that was expected! The worst thing was the frozen boots - they had got wet with all the snow the previous day and even though I stored them in side a stuff bag inside a dry bag inside my rucksack, they were stillf rozen the next morning. To be fair, pretty much everything was frozen on Sunday morning! Am going to refine my7 setup slightly for next time I go out. Am making my own underblanket and am going to use one of those reflective blankets on top of the roll mat. Also thinking about a new way of suspending the tarp. Anyhow, great fun and by far the coldest night I have ever slept in my hammock!