Let me tell you, this sheet has been a life saver! If you are considering this purchase, do it! I have not had my sheet come undone at all. My SO is a crazy sleeper and theyve stood up to him tossing and turning all night. Before I was going crazy because no matter how gentle I was on my side of the bed, I always woke up with the fitted sheet half off and I cant stand that! My only regret is not purchasing multiples. Cannot say enough good things about this sheet!!!