Simmons' designers engineer mattresses like they're luxury cars, always looking for ways to improve longevity and performance. The Beautryrest Recharge Mandevilla plush-top set starts with a multilayer 12" mattress that includes three types of CFC-free foam. These foams, combined with Beautyrest individually wrapped coils and Simmons' AirCool design, form the Recharge sleep system. The coils adjust independently to the weight and contours of your body, allowing you to find a comfortable position without disturbing your partner or 300-pound dog or cat. The AirCool design comprises a special mesh border fabric and foam encasement that enhance breathability and airflow.