Ugg boots, also spelled ugh boots and ug boots, are a style of sheepskin boot, with wool as the inner lining and a tanned outer surface. Ugg boots often have a synthetic sole, although this is not universal
() In Australia ugg boots and variants like ug, ugh or uggs are used generically. A trademark of UGH-BOOTS was registered in 1971 but was not enforced and generic users of the terms successfully applied for its removal in 2006 ().