Our bodies sleep best at the right temperature. With powerful cooling and phase change technology, you get the perfect heat management system for deep rest. An impressively cool-to-touch cover instantly soothes and relaxes your body for sleep. Phase Change Gel is infused in the top layer of foam and reacts to your heat level – warming when you’re cold and cooling when you’re hot. All-night cooling EVENcor GelMAX Memory Foam and breathable support foam and airflow foam enhance the comfort to give you rejuvenating rest.