Ugg boots with wool inside and with a tanned outer surface, UGG Classic Crochet is a style of sheepskin boots. Ugg boots have a synthetic sole, although this is not common. Since the early 2000s, cheap uggs have been considered a fashion trend.
In the Arctic and China, sheepskin boots have long been popular with people in rural. They are used for skiing traditionally. Their popularity increased as a result of World War I and World War II, during which they became popular with aviators because of their need to keep warm in unpressurized plane. Sheepskin boots have been popular with surfers and competitive swimmers since the 1960s for keeping warm while out of the water.

The terms UGG Classic Mini boots, ugh boots have been used as generic terms for sheepskin boots in Australia since the 1970s, when they appeared in advertising and other publications for the first time.

The natural insulative properties of sheepskin gives thermostatic properties to the boots: the thick fleecy fibres on the inner part of the boots allow air to circulate and keep the feet at body temperature. It means that Ugg boots can be worn without socks.

Since humans first cultivated sheep, cultures have made soft UGG Classic Short on sale. Their popularity was short to once leather tanning of more durable leather products like cowhide increased. Not like cowhide, the sheepskin is soft and easily abraded, limiting it to gentle use. Ugg boots gained in popularity as a result of World War I and World War II, when they were popular with aviators because of the need to maintain warmth in non-pressurized planes.

The combination of its soft shank and sheepskin interior means that UGG Classic Tall discount are designed for casual, short-term, and not for situations which require sturdy, protective footwear. Cleaning products should never be applied directly to the sheepskin, as this may cause permanent damage.