How effective is this pad when placing an area rug on carpeted surfaces?

Superior Lock is one of the best rug pads on the market for most wall to wall carpeting applications. The only time this pad may not be as effective is with very thick area rugs on very thick carpeting. A felt and rubber pad gives you the option to rearrange rugs multiple times, as opposed to thinner dual adhesive pads or double sided tape which need to be used each time you move your rug. We’ve tested alternative dual adhesive carpet pads in the past with limited success.