SMU = Special Make Up (Special Sample, Special Sample refers to the special style, usually the quantity is not too large, and it may be exclusive to a certain country or region). Don’t listen to those who don’t understand English. It’s nonsense to talk about things designed at home and abroad...
It’s a mess. Generally, sports brands are designed abroad and manufactured domestically. I am a shoemaker, so I know these terms very well, and they are definitely not the ones mentioned above. He talks about "made in China", "a series" and "that's how it is named". If you know something, you know it. If you don't know it, you don't know it. It's knowledge! Don't mislead others if you don't know!!!