The Brenham Mattress offers support and undisturbed sleep with PrecisionFit Coils featuring MaxSupport, designed to give you just the right amount of stability. Encased coils cut down on motion transfer, so you can rest easy. SealyChill Technology helps keep you cool through the night, while the DuraFlex Coil Edge adds durability that lasts year after year. *About Split Cal King: Each split California king mattress is comparable in size to a twin, and two are required to create a complete setmaking it easy to mix and match comfort levels for personalized sleep.