You can test the standard. If you can't or are too lazy to test, you can take out the sole of k7 (genuine but tight) to see if there is a zoom air cushion at the heel, and use the forefoot to pull the leather off the insole (genuine with glue) to see if there is a zoom air cushion. If you have both, it's OK. There is also the price. At present, the lowest price on Taobao is over 500, and100,200 is definitely fake. I hope it helps you.