Ugg boots are known in Australia and New Zealand as a unisex style of sheepskin boot made of twin-faced sheepskin with fleece on the inside and with a tanned outer surface, often with a synthetic sole. The boots originated in those countries, initially as utilitarian footwear worn for warmth and comfort and later adopted by surfers there during the 1960s. In the 1970s, the boots were introduced to the surf culture of the United Kingdom and the United States by local surfers returning from surfing competitions in Australia. 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, yet in Australia they are worn predominantly as slippers and associated with 'daggy' fashion sense, and 'bogan' culture. There has been a dispute between some manufacturers of ugg boots, as to whether 'ugg' is a protected trademark, or a generic term and thus ineligible for trademark protection.
Contributions by Shoaler, Hoary, and D f cornish.