I absolutely love these sheets. They washed well straight out of package, and didn't wrinkle much, even with high speed washer. The Martex Sheet Set in white worked well with both our old, traditional inner spring mattress, and with its replacement of a gel mattress, even when it still needed to expand the bottom edge. The sheets didn't shift overnight, and we slept comfortably, night after night. We used them both in warmer weather, and now that it's colder. We will absolutely buy more! [This review was collected as part of a promotion.]