Night Therapy 12" Pressure Relief Memory Foam Mattress & Bed Frame Set - King Top layer of breathable 1 Cool Foam, and a micro fiber layer for added comfort and less heat build up Second layer of 2 heat sensitive memory foam with Green Tea, Charcoal, and Natural Castor Oil which minimizes the use of petrol based chemical oils, working to eliminate chemical odor and to minimize growth of bacteria in a natural way. Third layer of 3 pressure relief foam eliminates pressure points Fourth layer of 6 high density foam to provide long lasting durability and stability Night Therapy Real Mattress in a Box embraces the idea of "Sleep Green" so that the comfort of your sleep environment is balanced with ingredients that are safer for you and the environment we all share