These sheets stay on my adjustable mattress, as advertised, and that's the major reason for the high rating. They are also a nice shade of blue and hold up on the wash! Kudos there. But they aren't as cool as sheets I have purchased elsewhere, granted those cooler sheets did not have the stay-put corners for the adjustable. So, in the end I am sacrificing slightly on the temperature to get the performance. Can't have it all.