Remarkable cutting-edge technology in the Ashley-Sleep Realign 15 California King mattress delivers all that's needed for exceptional comfort as you sleep. AmbiAire, one of two innovative foams found in this mattress, draws heat and moisture away from your body more quickly and consistently than other standard foams. The second foam, MemGel Swirl along with a luxurious phase change material cover keeps you cool and comfortable. MemGel Swirl's innovative combination of gel and memory foam enhances pressure relief. These foam layers work with a high density support core to ensure the firmness you need without losing the soft feel you crave for great sleep.