With water proof surface outside, fire resistant layer inside, velcro at the opening of the bag, TF fireproof document bag can give your valuable/important documents an overall protection. Made from woven fiberglass material, the heat resistance of bag can up to 1000°F, great for use in the safe and safety deposit box, truly a must have item at home! Warning: this bag is made of fiber glass, and the fiber glass may incidentally shed during use, please wear gloves while handling, thank you!