UGG boots originated in Australia and New Zealand. They are made from twin-faced sheepskin, with the wool inside and a tanned outer surface, and have a thick rubber sole. They are known for their warmth and comfort, and have become popular in colder climates. They are available in a variety of styles, including the classic tall boot, a shorter ankle boot, and a slipper-like loafer. UGG boots have become a popular brand and a fashion statement.