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The California king foam mattress is ideal for taller people, and it's as wide as the standard king to fit more than one sleeper comfortably, measuring 84" in length and 72" in width overall. Standard (latex) foam mattresses have more elasticity than memory foam mattresses, with a faster snap-back time that results in more bounce. While some brands use fewer synthetics than others, there's no such thing as a "100% natural" latex foam mattress.