While the quality of the sheets is nice, they don't fit the super single waterbed as advertised.  Very disappointed!  This size is difficult to find and when the website said the XL Twin was the same as "super single" I was pleased.  Received the shipment, struggled to put them on the bed and they were so small that the corners of the mattress were pulled in from the frame.  By morning two of the corners had come up because the sheets are toooooooo small.  Won't make another purchase - sorry.