From Sleep Innovations, 2-inch high memory foam topper for extra-long twin mattress; great for college dormitory use * 100-percent polyurethane memory foam with 3-pound density; molds to body curves for pressure point relief and improved circulation * Naturally hypoallergenic with antimicrobial finish; open-cell design for air flow and neutral temperature on sleep surface * After unpacking, allow up to 72 hours to fully expand * Made in the USA, topper measures 80 inches long by 39 inches wide by 2 inches high