Polyester/Spandex cover sleeps cooler and provides more airflow to the use. Gelution® Memory Foam further reduces body heat and increases sleeping 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 a conventional memory foam. Ultra-Fresh®, an anti-bacterial, antimicrobial additive, provides Glacier Freshness™ to the mattress. Certi-Pur US® foam means the mattresses meet independent testing requirements for quality and environmental safety.