I was disappointed with the rug once I opened the box. For what I paid, I could have gone to the local Ross and got the same quality for about 60% less. There is not an actual rubber backing on the rug, but there is something (don't know what to call it ). However, I put it on the ceramic tile and there was very minimal movement when I step on it. It will work fine outside the shower, but I think I will look for something nicer. I would not consider this rug to be plush.
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