A thinner carpet pad. I wonder if having the pad thinner will help hold rug in high traffic areas. I have the same brand but a thicker version in bedroom under carpet that a heavy adjustable bed sits on, I now wonder if it will show the depressions by legs more than a thinner pad would. Only time will tell but keep in mind the pads that cost less usually are not as thick. That can be a good thing or a bad thing.