I just purchased a new king bed with split XL twin mattresses.  I could not find a king set anywhere locally to fit my new bed.   The only thing I could get were individual sets for twin XL beds, I didn't want 2 seperate flat sheets to go over, I wanted a regular king flat sheet to fit over both mattresses.  These sheets are exactly what I was looking for and the quality is outstanding.  I purchased two sets, and have washed each set out twice with no problems at all.  I would purchase these again!!!!