The biggest bed size available is known as a Super King. In Australia, bed sizes range from Single, which is the smallest, to Double, King, and finally Super King. The Super King bed size provides ample space for couples or individuals who prefer an extra room to stretch out and sleep comfortably. It is the widest and longest bed size, offering plenty of space for a restful night's sleep. So, if you're looking for the ultimate in-bed sizes, the Super King is the way to go!