Includes short queen 60-inch by 75-inch and three-quarter size short full 48-inch by 75-inch in addition to standard twin, full, queen and king sizes * 2-Inch of 2.5-pound, memory foam on a 6-inch base layer of polyurethane foam, within a zippered stretch knit cover for a medium firm comfort feel * Temperature sensitive memory foam is open-cell construction, disperses weight evenly and gives a cooler sleeping experience than closed-cell foam * Serenia Sleep mattresses are made in the USA and carry a 20 year limited warranty against manufacturing defects * Memory foam is resistant to dust mites and naturally antimicrobial