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At 72" by 84", a Serta California king isn't actually the largest mattress size. A standard king measures 76" by 80", making it four inches wider with 32 square inches more surface area. The California king is, however, four inches longer than a standard, making it the perfect choice for anyone who needs a little more legroom or who wants a mattress that suits their narrower bedroom. Whatever need you're filling, a Serta California king mattress is sure to suit you.