B goods mostly refer to Nike's OEM, which uses the leftover materials of finished shoes and its own cheaper materials as they are. Because all OEM's have official drawings, they are not copied according to their appearance, and their ability is also worthy of recognition, so the workmanship should be good. Moreover, because the appearance of the fabric is left by the original factory, the difference between the appearance and the counter goods is very small, almost identical. However, because I have bought several pairs of these shoes, the workmanship inside is very poor and they are not durable. Of course, after all, it is up to you to choose.