with respect to the underbody, I think you get more insulating value from dead air between the sock and the hammock body down there than you'd get with a breathable but water resistant hammock body alone.
Originally Posted by Heber
Whether the insulation gain is large enough to justify the weight of an extra underbody or any other of a number of imponderables I can't say. But I do think there is a point to it.
I made one last winter:
I also have a bivi and a net hammock. That works well and involves not a lot of additional cost or weight. But then nor did my bridge bag and that's more thermally efficient.
ZDP, that is one cool system you came up with! Somehow I missed that thread.
I had thought about something like this at one point. My concern was that with so many cords I might have trouble with tangling. That's when I switched over to the bridge-based bivy idea.
The dead air space is an interesting thing to consider. My tendency is to rely on the CCF pad under me for all the insulation from the bottom. In fact I don't much care what the hammock body is made off per se (the part under me). The purpose of the DWR material would be mostly to protect from cold wind in the area above where the pad is, the sides and the top of the hammock/bivy.
Originally Posted by GrizzlyAdams