There are all kinds of UGG boots.

This article is about the type of footwear. For the brand known as "UGG", see UGG Australia.A pair of ugg bootsUgg boots (sometimes called uggs)[1] are a unisex style of sheepskin boots, made of twin-faced sheepskin with fleece on the inside and with a tanned outer surface, often with a synthetic sole.Originating in Australia or New Zealand, where they became popular in the 1970s, ugg boots emerged as a fashion trend in the United States in the late 1990s and as a world-wide trend in the late 2000s.There has been a dispute between some manufacturers of ugg boots, as to whether "ugg" is a generic term and thus ineligible for trademark protection, especially in the region of origin. Deckers Outdoor Corporation holds theUGG trademark in 145 countries worldwide.[2] Notable exceptions are Australia and New Zealand where the term is considered generic.[3] More than 70 registered trade marks in Australia and New Zealand include the term UGG, in various logos and designs.[4]