A California King mattress is a large bed size designed for taller individuals or those who prefer extra legroom. It measures 72 inches wide by 84 inches long, making it longer than a standard King mattress, which is 76 inches wide and 80 inches long. This extra length can provide added comfort for people over 6 feet tall. Due to its size, a California King mattress is ideal for spacious bedrooms. It often requires special bedding, including sheets and comforters, specifically designed for this size. Many manufacturers offer various materials, such as memory foam and innerspring, to cater to different sleep preferences.