The NSA Aluminized Apron features the 19 oz. aluminized OPF/Para-Aramid material and leather strap with a slide snap at wasit and neck that is used for protection against radiant heat, sparks, and molten metal splash hazards. ISO 9001 Certified. The fabric passed ASTM F955 and has acheived levels A, B1, C4, D3, and E3 of EN 531. ISO 9001 Certified.