As you know, Ugg boots are traditionally made from sheepskin. The wool is tanned into the leather, and the upper part of the boot is assembled with the fleece on the inside. The soles of the boots are made from rubber, and the stitching is often prominent on the outside of the boot. The fleece draws away moisture, keeping the feet dry and at body temperature. Today sheepskin boots come in a variety of colors, including orange, pink, blue and fuchsia, and are available in both slip-on and lace-up varieties. The height of the boot can range from just above the ankle to, in some cases, over the knee.

The terms ugg boots, ugh boots and ug boots have been used as generic terms for sheepskin boots in Australia and New Zealand since at least the 1970s, although individual accounts have suggested that the terms were employed earlier. The 1970s saw the emergence of advertising using the names, but Brian Smith has stated that the boots were referred to as "Ugg boots" long before the word was trademarked, and Frank Mortal claims to have been making ugg boots under the "ugg" name since 1958. The derivation of the name is also unclear, but one belief is that the term "ugg" is an abbreviation of "ugly"
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Ugg boots became a popular option for competitive surfers, who used the boots to keep their feet warm after exiting from the surf. It was surfing which helped popularizes the boots outside of Australia and New Zealand, when surfer Brian Smith started selling the boots in the US through the company Ugg Holdings Inc in 1979. Later, popular ugg boots emerged as a fashion item in the United States, with celebrities who choosing to wear the boots, creating increased demand.

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