The biggest diff is that the fakes don't have the tech, so they won't have the air unit, when you press on the bottom of the sole, it feels softer to the touch then real ones. Thats the easiest way to tell, visually though, for high high end fakes, you'd literally need a retail pair side by side to see the small differences like the little strikes on midsole are different and the stars on the toe aren't exactly the right size. On feet, its SUPER hard to tell. Don't be fooled by thinking that fakes are still total ****, the market for high end exact fakes is huge, and where theres demand, someone will supply.