Ugg boots are sheepskin boots which were originally flat soles and long, but now come in a variety of lengths and styles and have either flat or wedge heels.
3  The name “Ugg” is derived from the word ugly, which many would say that these boots definitely are. Another far less popular theory is that Ugg refers to the typical caveman impression to reflect the simple animal skin design and make up of Ugg boots.
4 Most people outside of Australia will not have heard about Ugg boots until the very late '90s, but the boot has a much longer history than that.
World War I pilots have been pictured wearing an Ugg-style boot which was called a &ldquo,Replica football jerseys;fugg boot”.