These sheets are very light weight, I read many reviews in making sure the fitted sheet was deep enough I have a pillow top with memory form on top so I needed 17 inches.
This set of sheets worked but they are made very cheaply I have never seen anything like this before a thin string of elastic like less than a eighth inch wide all along with boarded of the fitted sheet. They made this set to truly be one size fits all depth needed.
Not a good buy I don't think they will last long, should have returned them

Pros: will fit any mattress
Cons: made very cheaply