The one inch 4-pound top layer of open-celled gel swirl memory foam combines the cooling and heat dissipation benefits of gel * 1.75-Inch layer of transition foam over gel memory foam layer over an 8-inch base layer of polyurethane foam to give a medium-firm comfort feel * The mattress is covered with an attractive stretch knit fabric with suede border and tape-welt for a luxurious faux pillowtop look * Manufactured in the USA, Serenia Sleep memory foam mattresses carry a 20 year limited warranty against manufacturing defects * The cooling gel memory foam is manufactured using natural bio-based polyols