Had my enLIGHTened cuben quilt out again this weekend. Overnight low was 14.5 degrees F, wind gusts probably up to 20-25 mph, though I can't believe they had any effect. I was comfortable. Quite comfortable. I had the footbox zipped and closed except for about a 3" hole open at the end of the footbox. No cords around me at all, just tucked the quilt in as necessary.
Setup: MLD DuoMid pitched pretty much to ground, no inner, polycro and tyvek groundsheet on 3-4 inches of snow, Ridgerest on that, TiGoat Raven XLW with NeoAir inside, quilt on that. Bivy was open at the head no less than 4-5 inches at any time, often open all across the top. No net used.
I wore: Nunatak Skaha sweater, standard, medium, with hood. Icebreaker 200 1/4 zip top. RAB vapor rise pants with Icebreaker 200 boxers, Smartwool liners, Icebreaker thick hikers and Chugach booties.
Put the Skaha hood down and put on an Icebreaker 200 beanie sometime during the night.
Condensation at the foot area but no where else. Bivy was dry except at the foot. Quilt was dry except at the foot (though top of the quilt, not the inside, and there was absolutely no condensation on the inside of the DuoMid, wind took care of that. Bivy was touching the side of the shelter during the night as I kept sliding around. Still trying to figure that one out, the condensation, not the sliding).
I almost took the Skaha off within 15 minutes of getting in bed I was so warm. Decided to keep it on. Good move, I think. With the quilt/clothing/bivy/pad setup I had, I think I could have easily gotten down to 10 degrees or a few less than that and still have been comfortable. There were times when I thought my legs were a bit too warm, and my feet as well. But I was too lazy to kick off my booties and remove the pants. I never felt cold at all. Not even 'cool.' 10 degrees easily with this setup, and it's all stuff I'd have, nothing extra just for sleeping (In fact I wore the vapor rise pants, 1/4 zip shirt and socks hiking all that day.)
Still amazed at what this quilt will do for its weight.