Although most people simply use the term “floor mats," technically there is a difference between mats and liners. Floor mats are flat, light, offer minimal protection for carpets, can slide around under your feet, but are easier to remove and shake out. Mats are best for temperate climates without snow, mud, salt or heavy rain.  Floor liners are all-season and have a fitted form with raised edges to provide more protection for carpets. They are heavier than mats and have greater non-slip protection, ridges to collect rain, snow, salt and spills and provide superior coverage for underlying carpets.