Generally speaking, if you want to buy genuine NIKE, only the shoes in factory stores are the cheapest, because the shoes in discount stores are old, which may be sample shoes, so there may be some minor problems such as color difference, but the size of men's shoes is too big or too small, because NIKE earns futures money and is new, but regular stores can discount them three months after arrival. Personally, I think the old and new models are new. As long as you are comfortable and like it, there is no need to buy new styles and waste money. Reminder: Nike's old and new models are the same shoes with slightly changed colors, and the general styles are less.