I recently purchased a ProBreeze Tempur-Pedic mattress so I bought the sheets thinking they would be a great fit for my 12 inch mattress. These are the worse sheets I have ever purchased. They feel like cheap cotton and they are not cool at all. They also were not a great fit despite being made exclusively for Tempur-Pedic. What a disappointment. Tempur-Pedic has a no return policy. Love my mattress but I don't recommend the sheets. Buy them elsewhere and make sure they have a return policy. Shame on Tempur-Pedic for selling such a poor quality sheet set with no return policy