Expandable Cover included with Twin 3 Inch Serene Foam Advanced Supportive Air Technology Mattress Topper Made in the USA Includes Quilted Mattress Pad to Protect Your Serene Foam Topper Next Generation Foam Technology, Utilizing the Newest Advanced Supportive Air Technology Serene Foam reduces pressure points that cause you to toss and turn, so you sleep better. Topper features a Supportive Air Technology formula and a medium soft feel Made in the USA using enviromentally friendly processes. CertiPUR-US Certified.