I am writing in regards to fake retro air jordan sneakers. The fastest way to tell if they are authentic, you must see or ask to see the serial number tag on the inside of each shoe. If the tag has any stitching on it, or you can tell it was sewn on, they are FAKE!  Real jordans have the tag simply glued on with absolutely no threads or stitching around the border of the tag. One other way, which unfortunately is usually too late, you buy a size 12, but when you get them on your feet, they fit like a 10. So to prevent this, be wary of any seller who says to "order one size bigger because all jordans run small". When in fact, all jordans really run TRUE TO SIZE.The last few ways to tell, if a feedback check is not an option,is if a seller comments that the shoes are "Straight from the factory," and in the sellers description, he/she does not state that the shoes are "100% authentic" but uses "100% Brand New, or Never Used." Also take note of a seller having air jordans 1 - 23,selling them for only $99, and also coincidentally has every size, there is need for some questioning.I hope this helps when you are not sure, and i just want to add one more way to spot fakes. If the colorway  of the shoe looks a little "too red" or just "off", and you see colorways that cause suspicion.