They are everywhere. Those boots that are made of sheepskin or something pretending to be sheepskin. The UGG boots and their subsequent versions changed the street style when it comes to winter footwear. I have heard that they are very warm.
The can look good, however on a very slim leg only. Otherwise they are uggly and make the leg ugglish too. That's is my impression, but have a look at a wide selection of boots encountered on the street!
In some cases they are obviously not the right choice
no matter what.
Their only advantage it seems to me is that they are warm and so we are flooded with them on the streets of London
However there is no doubt at all in their global appeal.
UGGs and cousins break through age barriers.