It was claimed by the ad that the sheets to fit mattresses up to 17 inches, which is why I bought them. Unfortunately, they do not fit the sides because my mattress despite it being only 14 inches deep. In addition, when I think soft jersey, I imagine soft and fluffy, while these ones are not. My friend got a set of Great Bay Jersey ones for me, and they are fantastic. These are enough and will work well for the winter season.