Upgrade your bedroom with the best California king mattress from Costco, specifically engineered for those who crave extra legroom without compromising on support. Measuring 72" x 84", a Cal-king bed is the ideal solution and best for tall people who need that additional length to stretch out fully. Our collection features a variety of premium constructions, from the deep, contouring pressure relief of a high-density memory foam mattress to the responsive, multi-layer support of a hybrid California king mattress. Many of our models incorporate advanced cooling technologies to regulate temperature throughout the night, ensuring you stay comfortable regardless of the season. Whether you prefer a firm surface for spinal alignment or a plush feel for joint relief, all our California king options are adjustable base compatible, allowing you to pair your new bed with a motorized frame for the ultimate personalized sleep experience.