I bought two of these pads, one for use under a rug on top of carpet, and one for use over hardwood floors. I was really confused by the array of rug pad choices, and finally just dove in on the basis of others' reviews. This rug pad is fairly heavy, although you can cut it to fit under a rug. (Recommend that you use a ruler and draw a line on the pad where you intend to cut with a black marker. You can use heavy scissors, but if you have a sharp tool, that works faster.) The pad provides sufficient heft to improve the comfort level when walking on the rug. The only reason that I rated it "good" instead of "excellent" is because both of my pads (on carpet and on hardwood) move around a little with traffic, so I find myself slightly adjusting the rugs on a regular basis.