Durahold
This is the best product to give your area rug a firm cushion and a non-slip backing. 1/4” thick felt with a rubber backing.
$1.90 per square foot
Felt
This is the best, lower priced alternative to Durahold. It works where sliding is not an issue. 1/4” thick felt without a rubber backing.
$1.20 square foot
Omni
This is the best product to keep a rug from sliding with a very low profile and a minimal cushion. 1/8” thick.
$1.65 square foot
No-Muv
This is the best product for area rugs on wall-to-wall carpet. 3/8” thick
$2.25 square foot