How can you tell if real ugg boots are fake?

You can tell if they're fake if the cloth rips within the next week or so. I'm 10 and i love uggs but you need to know if they're real or not. Once I got a pair the cloth ripped the next week and i was kind of upset I spent my money on that stuff. Make sure to not get them at Walmart. They only last for three weeks. Benn there, done that, don't wanna go back.