I bought a pair of James IV, white and blue. I'll tell you how to tell. First of all, from the appearance, although it is not very easy to distinguish, it looks really volt-like. What you can really tell is that it is heavy in your hand and you can feel its material. The most important thing is to take out the insole inside, which is really thick and elastic. Of course not. In fact, the four generations are easy to distinguish because of their high technology.