Find out what size mattress is best for your bed frame, this will depend on how high off the ground you want itking size bed set, There are many factors that you may not have considered when purchasing a mattress, such as the height of your bed frame. King size mattresses come in four different sizes: standard king, Eastern king, California king and world king.In king size bed set The best option for you will depend on how high off the ground you want your new mattress to be. We hope this article helps!