We recently purchased an adjustable base bed and a Ver-Tex 6.0 mattress protector and loved the coolness of our protector.  We didn't realize how hot our old one was.  However, because of the smooth fabric of the protector, our fitted sheet was always sliding off the corners even if we didn't adjust the bed.  We purchased these sheets because the information stated it was good for adjustable beds and it breathed well.  We've been using the sheets for a while and they've been washed a few times.  So far the sheets themselves are holding up great and the fitted sheet stays in place!  There are generous sides on the top sheet so they should be long enough to cover almost any mattress and be able to tuck in the sides (if that's your thing) and there is plenty of stretch to them.  The only "issues" I have is that the sheets are so smooth my comforter likes to slide off during the night and I'm afraid of pulling them too hard that they stretch even more given the nature of the fabric.