Gentex Corporation is one of the world's largest suppliers of aircrew and tank crew helmets. The company is comprised of four business units that include Gentex Helmet Systems, Gentex Respiratory Products, Gentex Electro-Acoustic Products and Gentex Performance Materials. It offers helmets and eye protection; oxygen masks and related items; electro-acoustic products; Lifetex chem-bio products; and Dual Mirror aluminized fabrics. Solutions available are Filtron light management, Clearweld laser welding andprecision polymer processors. Gentex maintains its corporate headquarters in Simpson, Pa.