Last night I tested my new cotton hammock sock at 5 deg. above zero. It was a huge success, as I stayed toasty warm with minimal condensation inside the sock. I weighed the sock and it comes in at 2.5 lbs. Not lightweight, but certainly light enough to carry and no weight for stakes or a tarp.
Another advantage is the ground is frozen like a rock here, so I didn't have to deal with staking a tarp.
For insulation from the outside, in: 1. The sock; 2. My new down 0 deg. quilt from Enlightened Equipment; 3. My new peapod made from a 0 deg. rated synthetic sleeping bag. 4. The hammock; 5. Reflectix pad with shoulder wings. Total weight came to 9lb. 14 oz.
I wore wool long underwear top and bottom. Wool pants and wool sweater. Down pants and down booties with wool socks. Synthetic anorak with hood and coyote fur ruff. Synthetic hat.
Unlike the Frozen Cheesehead Hang earlier this year, I stayed nice and warm. Both my feet and shoulders were warm, and I think the peapod was warmer than the down under and over quilts that I used at the Cheesehead.