Abstract: A fireproof thermally insulating barrier for a safety garment, the barrier having a front face for facing an external source of heat or radiation, and a rear face opposite from its front face. The barrier includes a plurality of perforations, each opening out to the front face and to the rear face of the barrier. A method of manufacturing such a barrier and a fireproof safety garment comprising at least one such barrier as internal thermal insulation are also provided.