Personally I don’t like Ugg boots so don’t own a pair but I was surprised to read this article which suggest they could damage peoples feet. It seems the boots which are actually made to be worn inside are not suited to outdoor use. When they are worn outdoors the foot slides around inside the boot and leads to ankle, knee, back and hip problems. The problem can be particularly acute with teenage girls because their bones are still developing. The message here seems to be that the boots are designed to worn like slippers and that you should purchase something more sturdy for outdoor pursuits.