They look similar, but they are not the same. Â Suede is leather that is finished on the flesh or underside of the hide. Â Thus you sometimes hear suede referred to as "reverse calf": the other side of calf hide. Â (The standard, top, or outer side is the side that is smooth and can be polished to a high gleam.) Â Not all suede is calf, but all suede is the flesh or inner side of a skin. Â The napped effect is in that sense natural. NuBuck is leather whose topside has been treated (sort of "scratched") to simulate a sueded, napped effect.