About 3 months ago I purchased a tempurpedic mattress. I then purchased your sheets. Unfortunately, the sheets do NOT stay tight on my mattress, causing buckeling throught the entire bottom fitted sheet. Making the sheets extremely uncomfortable. The straps provided on the corners to prevent this problem don't stop the sheets from buckeling. Perhaps, your sheets are made for a much thicker mattress to prevent this buckeling problem. My new Tempurpedic mattess is 12 incles thick. Your fitted sheets are not made to fit the way they should on your 12 inch thick mattress. I would LOVE MY MONEY BACK. What a waste of money for an extremely expensive defective product that don't offer a money back guarantee.