An often overlooked add-on to a rug purchase is a pad. Rug pads, however, are very important for a variety of reasons which include increasing the longevity of the rug. If you make an investment in a beautiful area rug, it is well worth it to spend a few dollars on a rug pad. In addition to increasing the life of the rug, the pad secures the rug in place so that you, your friends and family will not slip on the rug and it also adds a cushiness under foot and makes the rug look more luxurious. Finally, depending on the type of rug you have...hand-knotted, hand-tufted, bound carpet to mention a few...a rug pad can protect your floor from the backing on a rug that can scratch a floor.
The type of rug pad that I recommend is the Durahold rug pad. It has a rubber backing on one side...that side sits on the floor...and a recycled felt pad on the other side. See pictures below.
A great source for these rug pads is www.bestrugpads.com