Since I drive the car also in the winter and where I'm from they sprinkle the roads with gravel when snow falls, the liners save the wheel wells from a lot of stonechips. I didn't like that the original ones are made out of carpet and they stay wet for qute a long time, so i have bought aftermarket plastic ones from some Polish manufacturer. Sadly the quality of them was really bad and I managed to fit only the front ones after a lot of modifying, warping and cutting. But no chance with the rear ones. So I attached some ruber lining on the edges of the original rear liners to keep the wet carpet from touching the metal. I take them out once in the while and give them a thourough wash, while keeping on top of rust prefention of course, that is key.