The thermal food cover™ goes over casseroles, appetizers, breads and more to keep food warm before and druing a meal while entertaining. It also acts as a hot pad to protect hands and surfaces when removing hot pans from oven. Constructed of a quilted insulated top layer and non-stick FDA compliant silicone layer. Can we used to cover and keep foods warm for up to one hour. Non-Stick surface can be wiped clean with soapy cloth. Thermal Food Cover can be machine washed - dry flat or hang dry. Extra large size (18"x 11"). Can withstand temperatures up to 475 degrees F.