Can't beat it below freezing either. Just add CCF pad, mylar blanket, poncho, peapod/thicker/second underquilt, extra clothes, and/or a bugnet overcover. Some combo of these elements has served many a hammocker well. Closest I've come to freezing was 33F and all I had under me was a CCF; I woke a few times because there was a slight chill on my back. Wasn't enough to rustle me out to add in a mylar blanket, however, though that would have likely added the few degrees I would have liked.