I often hear people ask for a Rainproof Rug pad. The closest to this is a Rainproof pad made for under wall to wall carpeting. Even in this case, the waterproof aspect is still not a guarantee and could cause problems by trapping any moisture between the carpet pad and the carpet above it. In the world of area rugs, although there technically is no 100% Rainproof Rug pad, there is something that comes close.
