Just bought a pair today from an Uggs authenticated retailer. I also have a pair of fake Uggs, purchased online. The label on the back of the fake pair has the first "G" crossing over into the right side of the "U". On the real pair each letter is complete. One sure way to tell if they are fake is pull on the lining toward the center of the shaft on the inside of the boot. If the lining pulls away from the boot itself, they are probably fake. The lining in authentic Uggs is actually sewn to the boot and will not pull away, I was told today from the retailer I purchased mine from. The real Uggs are so much lighter weight than the fakes. Hope this helps.