Polyester Spandex cover sleeps cooler and provides more airflow to the user. Gelution Memory Foam further reduces body heat and increases sleep comfort. An increased amount of memory foam product adds more memory foam comfort and encourages deeper sleep and heightened body recovery following sleep. Construction and health additives to the Sovereign reduce allergens, is hypoallergenic, anti-bacterial, anti-microbial. Along with easy to remove zip off cover for easy cleaning, the mattress provides cooler sleeping surface and lasts longer than conventional memory foam. Ultra-Fresh, an anti-bacterial, anti-microbial additive, provides Glacier Freshness to the mattress. Certi-Pur US foam means the mattresses meet independent testing requirements for quality and environmental safety.