The California King is a mattress size found primarily on the U.S. West Coast (hence the name). It's longer and narrower than the traditional King, measuring 72" x 84" (the traditional King size is 78" x 80"). This isn't really a big deal except when buying fitted King sheets. Flat King sheets are the same size regardless of the type of King.

Contrary to assertions by Everclear, California Kings are no more susceptible to fire than other sizes of mattress.

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