The rigid four-layer structure of the Ultramax guarantees that the mats keep their precise fit to your car. The bottom layer is the non-slip backing. On top of that is a propylene mesh layer for stiffness, to keep the mat from warping. Next is a water-resistant latex layer that keeps the car floor pan dry. The latex is covered with a woven polypropylene backing for the luxurious tuft, which is 5/16 inch deep and made in heavy 2-ply, 32 oz/sq.yd., continuous filament nylon yarn. This is a durable and extremely long wearing mat.