Made of polyethylene (PET) and aluminum. Size: 200 x 160cm. Thickness: 12 microns. Keeps 90% of heat radiation. 1 silver surface / 1 gold surface. Silver surface on the outside: reflects heat rays and isolates from heat (effective air conditioning for a tent, caravan or car). Gold OR SILVER surface on the outside: isolates from moisture, cold, and rain (in case of an accident, helps maintain body temperature).