A traditional king size bed is a bit shorter than a California king size bed, but it provides just as much space and comfort. We have a wide selection of king mattresses from the top brands in the industry. In addition to a wide selection of brands, we have a great assortment of king size mattress types. Shop Eurotop, pillowtop, memory foam, hypoallergenic and more! Get all the space you want and need with amazing comfort when you get a king mattress from JCPenney.