State of the art gas mask uses standard 40mm NATO threaded filters, has NBC proof drinking system, and comes with NBC canteen specially designed for the SGE-1000. This is the best deal available for a fully rated NBC mask-exceeds specs of US military. Full facial sheild provides great visability and is ballistic hard polycarbonate. Features a six point head harness and an effective voice emitter diaphragm. The SGE-1000 is a new model, and adds a complete drinking system, and several new re-designs over the SGE-400.