The PowerCool Firm is our new sleep system that brings all the benefits of the original version coupled with a refreshed look and firmer feel. The firm mattress provides extra support. PowerCool Cooling Knit Fabric Cover Made specifically for the PowerCool, this cover not only breathes, but the air flow creates a cooling sensation keeping you comfortable while you sleep. This highly advanced fabric stays cool-to-the-touch due to its superior breathability and temperature regulating properties that move heat away from the body. Ventilated AdaptiFoam™ While most of our foams have natural breathable properties, we often can enhance these further through ventilation. It is much more than just a pattern of holes through the foams. The larger added channels allow the micro-channels to breath horizontally instead of only vertically. Ventilated Flex Comfort Foam While most of our foams have natural breathable properties, we often can enhance these further through ventilation. It is much more than just a pattern of holes through the foams. The larger added channels allow the micro-channels to breath horizontally instead of only vertically.