I need a new sleeping bag and I'm new to hammocking. I'm looking for a 40 degree bag for spring/summer/fall use in NC. I've been told while in a hammock down bags will compress more on the bottom and leave me cold while a synthetic bag will not, or at least not as much. I have a thermarest prolite4 and ridgerest. Not sure which of those to use as well. Does anybody use a down sleeping bag w/o underquilt in moderate conditions? What are your experiences? Anybody who has used both a down and synthetic and could give me differences would be ideal. I like the idea of down because I do the ultralite thing, but I would rather be warm. If I should get a synthetic no problem, just wanna know. Thanks in advance. This form site is the best!