Fills in the dips in our older mattress and makes it feels like a new one again. So, comfortable that we don't want to get out. The pad thickness is fabulous, and yes, your deep pocket fitted sheet will fit over it and it doesn't shift. The backing is made of spun poly, which you will need to watch out for when drying - even on low heat. If possible, line dry. This type of backing likes to melt even on low heat. This is the only drawback on this lovely MADE IN THE USA mattress pad.