That will depend on the thickness of your mattress. Standard bed sheets will fit a 12-16" thick mattress. Simply measure the thickness of your mattress and then add 2 or 3 inches to accommodate for the topper, and that will give you the new thickness of your mattress. If you are over 12 inches this may be a good reason to freshen up the look of your room with new deep-pocketed sheets. They make sheets up to 27" deep and can be found at most stores that carry a selection of linens. There is no need to sacrifice your comfort for looks.