I found that this mattress topper was not very comfortable and the thickness at the thicker end did not fit under any sheet I have and I have many extra deep sheets. if you sit on the middle of the topper it would just curl up and lift the topper and the sheet right off the bed. There are no real zones to the topper, so the support was not relieving at all. . On top of that the return process states that in order to return it it must be in the original shrink wrap which is impossible to do without factory equipment. It cannot even be compressed enough to fit in the rather large carton it came. So i am now stuck with this bulky unusable foam slab.