Knee boots by ugg australia one of ugg australias most beloved silhouettes the classic tall boot in top grade chestnut nubuck is the ultimate in casual comfort please be aware that our genuine ugg boots are only available in half sizes if you are normally a size 6 please order a size 65 as this is the equivalent size top grade nubuck upper soft sheepskin shearling lining moulded eva outsole genuine uggs are only available in half sizes