I'm used to wrestling a king-sized goose down comforter, so this twin comforter with down alternative is a real pleasure. Although it is certainly puffy, it is not markedly so -- but just enough to provide some coziness when needed if things are a little chilly at night. I don't suppose we'll keep it on through heat wave season, but otherwise, I see it on the bed pretty much 9 months of the year.
To protect it -- it's a beautiful sparkling white -- I did immediately encase it in a duvet cover, but if you want white on your bed, it would look fine with no cover at all. It's very well made. For a cover with strings inside, there are handy duvet tabs. I highly recommend this for a twin bed, which is the size we ordered for review.