Each of our 3 models (Journey, Utopia, Divini) use premium quality, high density foams for maximum durability and support. The top layer on the Utopia and Divini utilize the premier comfort layer available on the market today. It is a special “Dual Phase Change” foam which works at the molecular level to provide the best of all worlds for temperature regulation, comfort, and spinal support. Our foams are CertiPUR-US Certified® which you can learn about here:  www.certipur.us.