This lightweight and warm blanket is made of flame retardant fleece material.The fiber itself demonstrates a flame-retardant effect, making it difficult to burn and spread, so there is no need to worry about secondary disasters.In addition, it has very little to no flame retardant deterioration even after long-term storage.This product is certified by the Japan Fire Retardant Association.Packed with special aluminum film, it is very compact and takes up little space for storage.