Large Pavenex Fireplace Blanket Stops Overnight Heat Loss, In Black Pavenex- Carbon Fiber Material Large Pavenex Fireplace Blanket Stops Overnight Heat Loss, In Black Attaches to your metal screen (sold separately) with heavy-duty magnets Conserves energy and saves money by reducing nighttime heat loss Keeps heat from escaping up chimney after a wood burning fire Made from Pavenex, a fire-resistant carbon fiber material