I got a new firmer, 4 pound density, foam mattress to prevent "bottoming out" in the middle due to my weight and to keep my spine aligned. Unfortunately, when I sleep on my side, I wake up with sore hips. I ordered this 3 pound density topper and woke up this morning without any soreness in my hips.  Now I have the best of both worlds. I would recommend purchasing extra deep pocket sheets with this product.