Top layer consists of quilted bamboo rayon and polyester fabric, fiber padding, and fire barrier * Second layer of 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 pressure relief foam eliminates pressure points with fourth layer of high density foam to provide long lasting durability and stability * 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.