Mattress Forum

We just purchased a Tempur-Pedic Cloud Supreme about a month ago and are ordering a St. Dormeir cover for it.  Our mattress is 11" in height.  Which size pockets should we order to give it enough movement on the bed but not make it to shallow so it moves/comes off?  The 16" pocket says it is for up to 13" thick and the 24" pocket says for up to 20" thick.  Thoughts?  

Right now I have a very deep pocket one on there from our old innerspring pillow top mattress and it seems to be fine with tucking it in on the sides.  I had a cover we bought from the store on there but had to take it off due to it changing the feel and it making it so much hotter than it needed to be etc.  

Thank you!!