Sheets that are listed as 2 ply or 4 ply will not last as long or be as soft as one ply sheets. For quality, buy the lesser thread count sheet of one ply then the higher thread count sheet of 2 or 4 ply. 250 thread count one ply is the same as 1000 thread count 4 ply or 500 count 2 ply. It's a marketing trick to get people to buy the higher thread count for much more money.