WaterHog Car Mat - Personalized Large Full Set (4 pc) WaterHog Car Mats contain dirt and water to help keep your vehicle clean. Unlike any other car mat, WaterHog Car Mat's Personalized pattern allows you to personalize your car mats with a molded letter of your choice. The molded letter not only offers a a more authentic look, but also maintains a higher level of performance than competetive personalized car mats. For cars, crossovers, mid-sized trucks and small SUVs, use standard front mats. For full-sized trucks, large SUVs and mini-vans, use large front mats.