The California King size mattress is the tallest mattress on the domestic marketplace. It is 4” longer and 4” narrower than the standard King size, so actually uses the same amount of material as its counterpart. Mattress prices are based on raw material costs, so King and California King prices for the same mattress are identical. California King mattresses are best for taller couples. We generally recommend for sleepers over 6’3” tall to look towards the Cali King size. Now that you know the size mattress you prefer, shop below by Brand, Comfort Level, or Type to find the perfect mattress for you.