12" Night Therapy Pressure Relief Memory Foam Mattress & Bi-Fold&reg; Box Spring Set - Queen 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 Bi-Fold Box Spring Folding Foundation is made from heavy gauge metal featuring maximum edge firmness. No assembly required- remove from box, unfold, and lay your mattress on top.