Adds very little padding...though not what I was looking for.  I needed something to keep my area rugs in place (prevent slipping and movement of rug off the pad).  This product has failed miserably....rugs shift off the padding and rugs still slip when stepped on.  If you are looking for minimal padding and not interested in whether the rug stays put, this is your padding.  Otherwise, it is a pure waste of effort (ordering, filling out info, waiting for arrival, etc.)  and money!