The Sole1) The sole of real UGG ? boots have the UGG? logo on the Classic tall. A fake boot is flat.2) The sole in a real UGG? is flexible. The fakes are more rigid and stiff.3) On the sole of the boot at the bit where the sole joins the heel, the genuine UGG? has a smooth transition, On the fake there is a ridge or solid line clearly visible. You can see here with the genuine UGG? boot.real4) A genuine Deckers UGG ? Australia has got a copyright R circle next to the UGG ? logo on the sole. In a fake boot they will not have the R on the sole, here you can see the genuine on the left. Currently the fakes now may also have the r, so the presence of this alone should be used to decide the boots are real, more that, if they dont have the 'r', they are fake.real-sole5) The sole in a real UGG ? is about a half inch thick, the sole of a fake UGG ? is very very thin, probably about a quarter of an inch think.Labels1) The outside UGG ? labels are always the first thing to be scrutenized, these are slightly different. You will notice the 'Australia' on the fake boot is a bolder font and looks out of place. Which you can see on the right. On the real UGG.