At first sight I didn’t think this should be considered heavyweight at all but after a few nights sleep with it I know it definitely is.  Product is made very well.  Only 4 stars because it doesn’t have the middle loop to tie the duvet into at both ends- wouldn’t have bought it if I knew this.  But if you don’t mind having to reposition the duvet every now and then at the ends or know how to sew extra loops in I’d recommend it.  Price on it says 300 and with the sale I paid much less for the king.