They tacked down with thread on top of the comforter to keep the insides from shifting about. Now you see the thread from that very clearly since they used a dark brown thread, even on the light colored areas of the comforter. Does not look good and would be OK if they had matched the thread to the color they were sewing on. Had I noticed this in the pre purchase pics, I  would never have bought this.  Since my wife is a seamstress, it can be corrected but shouldn't have been an issue.