There are lots of sellers on here claiming their UGG's are genuine just because they have the UGG Australia tag, for a start these are the fake ones as they are not from australia but china. If you want "proper" UGG boots then find a website that sell them from australia.
I buy all my UGG's from a website called australianuggboots.com.au they are made of genuine sheep skin and are just much better quality then the UGG Australia. The lining is so thick and comfortable it feels like walking on a cloud whilst when i wear my old UGG Australia ones the difference is amazing they are still comfy but not half as comfy as my new ones and the lining is so much thinner.
UGG is NOT a brand but a style of boot! remember that when buying your next pair of UGG's!!