Also known as Western king, California king mattresses generally measure 72"W x 84"L - 4" narrower and 4" longer than a standard (Eastern) king mattress. This makes California king mattresses the longest mattress size available, and they still offer plenty of width for couples. The extra length makes California king mattresses ideal for very tall individuals. Like standard king mattresses, California king mattresses can be too large for some master bedrooms, or for moving through narrow passages. California king mattresses are used with a "split box spring/foundation" (two half-size box springs/foundations) to make them easier to move and set up. We offer innerspring, latex and memory foam California king mattresses at all price points and comfort levels.