1Water and Fireproofing: The mat is made of four layers of non itchy aluminium foil silicone fiberglass, which is resistant to 2000F, water proof and oilproof and easy to clean. The four layer structure enhances durability and the aluminium foil layer strengthens heat resistant protecting, keeping the deck safe for a prolonged period of time. 2Safe: The fireproof mat is suitable for decks, lawns and other floors, effectively blocking embers and oil spots to ensure the safety of outdoor flooring. Compared with traditional grill mats, it is ideal for not deforming under heat. 339 inch Rectangular Mat: Fits 39 inch fire pits, flat top gas and charcoal grills. Please measure grill size before ordering. Use with reflective layer up, do not allow heat source to come in direct touch with fire mat, keep at least 4in apart. 4Portable: Aluminium foil fire mat not only easily removes oil spots from carpet, but can be applid multiple times. The fireproof mat is foldable, easy to carry and store, suitable for parties, picnics, camping, barbecues and many other occasions. 5Barbecue Essentials: The fire pit mat not only prevents flames from directly touching the floor, but also effectively reduces the possibility of fire, making the barbecue process safer and more reliable. It is a must have tool for every barbecue enthusiast.