I ordered the 4x6 Uni-Luxe rug and it fit perfectly underneath my rug. Note the dimensions are slightly smaller, which is helpful so that it doesn't peek through underneath the rug. The pad is fairly thin but it still helps add cushioning, upgrading the feel of the rug. I also purchased the non-slip rug because I was not sure if the Uni-Luxe would be slip proof. I could have gotten away with just the Uni-Luxe as the bottom is slip proof. I recommend this product.