We got the extra deep, queen, all cotton, Cool and Lazy fitted sheet for our 12 inch Tempur-Pedic mattress on an adjustable base. After washing the sheet with 1 cup of baking soda and 1/2 cup white vinegar, I hung the sheet to dry. It's very soft and comfortable. I'm glad I didn't put it in the dryer. We barely got it pulled onto our mattress. I think if it had shrunk at all, it wouldn't have fit. So far, it has not pulled off the mattress, even when the adjustable base goes up and down.