Koolaburra Heart & Soul authentic Australian Ugg boot features sheepskin upper, replaceable sheepskin insoles, form fitting foam footbeds, comfortable EVA sole, and the shaft is decorated with kettle black designs. Heart & Soul is available in black, brown or chestnut. Koolaburra Heart & Soul is a authentic Australian Merino Sheepskin boot with the stylish kettle black design pick your words and make a statement.