I bought these sheets in the hope that the fitted sheet would fit tight and not look rumpled after sleeping.  The bottom sheet apparently has extra deep pockets and that is why the sheet doesn't fit tight.  I have to pull the sheet tight and tuck back under the mattress everyday, which is what I was trying to avoid.  Could be that my mattress is older, 20 years plus, so that might be why the sheet doesn't fit tight.  On the plus side, the sheets are very soft and have washed up very nice, no wrinkles when they came out of the dryer.