I love these sheets so much!! They are the only pair I have ever had that does not pop off the corners while adjusting the bed or changing over at night. I have a memory foam mattress with a 2.5-inch topper on an adjustable frame. The prior set I had was horrible and a total sunk cost. They tore in the corners after a few months and would not stay on the mattress, and I think is a shame. Buy this set of sheets and you can be confident that even if you do gymnastics on your bed, the covers will remain intact! I plan on buying a second set.