Suede: leather cut from the back, while the fibers remain on the surface, suede is less prone to damage than nubuck.
Cowhide
Sole
Rubber: a material that is very easy to maintain and you will appreciate it especially in rainy weather.
TrueSense
Details
Never wash shoes in the washing machine or dry them directly by the heater, as this could destroy the adhesives. In case of coarse dirt, use a brush/sponge first.