Area rugs with non-staining, vinyl rug pads are designed for use on hardwood floors. Vinyl rug padding will not discolor or damage your hardwood flooring, and it prevents slippage. Avoid foam back, plastic, latex or rubber padding rugs. Moisture can build up under these rugs and can damage your hardwood flooring.
Area rugs containing polyurethane padding are also recommended for your hardwood floors. The rugs provide cushioning and insulation as well as a firm non-slip grip.
Rugs containing fiber padding are durable but they don't provide as much cushion and insulation as polyurethane padding. Fiber padding contains recycled polyester fibers that allow your hardwood flooring to "breathe" or obtain air better through the padding.