noteworthy... it's best to layer mats if you're concerned about the original carpeting... usually people place a "spikeless" but thin mat (such as the original floormats that came with the car) first then layer Nomads or what not on top of it... we have several clients that uses 3 sets or more of floormats in their car, it sounds extreme, but most of them have really pristine factory carpets underneath, not bald spots, no flattened fibers etc.