Molded carpet
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Molded carpet[1] generally refers to the carpets used in the interiors of cars. The molded carpet is designed to hug the floorpans so there are no pockets of loose fitting carpet. The process of creating the molded carpet requires the original floor pans and having the carpet laid upon the pans with a backing in between.
There are generally two types of backings, poly backing and mass backing. Mass backing is the original type of backing that most car makers use. It's thicker and more rubber-like than poly backing. Poly backing is lighter, easier to bend and more mesh like than mass backing. Some molded carpets come with jute backing where your feet rest on the floor pans. This helps prevent the carpet from wearing out prematurely because the majority of the wear is where feet contact the carpet. The jute padding also helps prevent mildew which was more of a problem in older leaking cars than modern cars.