Ugg boots are a unisex

Unisex

Unisex stands for the meaning that either gender or sex will be able to, but can also be another term for gender-blindness.The term was coined in the 1962 and was used fairly informally...

 style of sheepskin boots

Sheepskin boots

Sheepskin boots are boots made from sheepskin. The wool on sheepskin has good insulating properties and so such boots are commonly worn when it is cold....

, made of twin-faced sheepskin

Sheepskin

Sheepskin is the hide of a sheep, sometimes also called lambskin or lambswool.Sheepskin may also refer to:* Parchment, a thin material made from calfskin, sheepskin or goatskin** Diploma, originally made of sheepskin...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 protected trademark, or a generic term and thus ineligible for trademark

Trademark

A trademark, trade mark, or trade-mark is a distinctive sign or indicator used by an individual, business organization, or other legal entity to identify that the products or services to consumers with which the trademark appears originate from a unique source, and to distinguish its products or...

 protection.