Hello everyone. I am moving into a studio apartment and I got a futon mattress similar to the styles they have in Japan. So that I can fold it up to save space during the day. I am trying to find something relatively warm but not too thick as I am a warm sleeper. I am having trouble deciding. Mainly because what I can't seem to figure out what the heck a duvet is! When I went to a linen store, they had duvets and they seemed very thin. I was limited in checking it out because i didnt want to pull it all the way out of the packaging. When looking at them online at Target and Amazon they look much thicker. From the definition at wikipedia.org it tells me it came from Europe and is used to simplify making the bed, because all you would have is the fitted mattress sheet and the duvet. Perfect! So if someone could tell me if it is thick, maybe similar to a quilt I am probably going to pick one up. One thing i noticed is that here in the U.S. duvets are cover that go over comforters to protect them. Anyone have any insight?