I used the green patrol bag last fall in Shenandoah National Park in my hammock. I used a 20F underquilt by Hammock Gear for bottom insulation. This was in a Hennessy Explorer hammock. I got a little cold on top but it was mostly due to the wind. So I'm adding a wind sock this year and I think that setup (Green patrol bag for top, 20F Hammock Gear UQ for bottom, and a wind sock) with be fine, maybe down to freezing. The wind has a huge effect on my comfort.