Hmmm, I have only ever noticed the yellow 'heavy' blanket in addition to the lightweight purple blanket - certainly nothing with 'down' or anything else thatresembles a proper sleeping duvet. Both SQ and NZ in their C products have a nice duvet.
The lightweight blanket example here:
http://i81.photobucket.com/albums/j2...eat1Aflat2.jpg
The heavier yellow blanket example here:
http://i81.photobucket.com/albums/j2...i-DSC07028.jpg
Cheers, TK