This is one of the best quality rug pads I've seen. It's thick and the rubber bottom keeps the rug in place nicely on my hardwood floors. I didn't know this when I bought it but it can also be used on carpet too if you put the rubber side up...I love the versatility factor. I'm using it under a shag rug with fine fibers and it adds a really nice body to the rug. Highly recommended!