A California King mattress is a large mattress size designed for those who need extra length. It measures 72 inches wide by 84 inches long, making it ideal for taller individuals who may find standard sizes insufficient. This mattress provides ample space for couples or individuals who enjoy stretching out while they sleep. The California King is narrower than a standard King mattress, which measures 76 inches wide by 80 inches long. This unique dimension allows it to fit better in narrower bedrooms while still offering plenty of sleeping area. Many people choose this size for its combination of length and comfort.