Ugg boots (sometimes called uggs)[1] are unisex sheepskin boots, made of twin-faced sheepskin with fleece on the inside and with a tanned outer surface.

ugg sheepskin boots often have a synthetic sole, although this is not universal. Heights range from around the ankle to above the knee, they are available in a range of different colours as both slip-on and lace-up varieties, and they are produced by a number of manufacturers. The natural insulative properties of sheepskin gives thermostatic properties to the genuine ugg australia boots: the thick fleecy fibers on the inner part of the boots allow air to circulate and keep the feet at body temperature.[2] This means that ugg boots can be worn without socks even in relatively cold weather.

Ugg boots are believed to have been first developed in Australia or New Zealand, although the exact date is uncertain they have been, at different times, identified with pilots in World War I who are said to have worn them for warmth in unpressurized planes, shearers in rural Australia during the 1920s, surfers and competitive swimmers who wore them in the 1960s and 1970s for keeping warm while out of the water.In the early 2000s, ugg australia boots became a fashion trend in the United States, leading to increased global sales,now ugg boots sale in every country,They become women first choice for winter snow boots.