Since the development of CR-39 and Polycarbonate over 40 years ago, there have been few advances and innovations in high impact-resistant optical polymer development. NXT® is a family of patented polyurethane optical polymers, transparent and unbreakable, originally developed for the military to provide superior protection and performance: NXT® was born in the USA in the early 1990’s when the U.S. Government contracted Simula Technologies to develop a new bullet-proof, transparent, and light-weight material capable of providing superior protection, reliability and longer lasting performance than polycarbonate. This material is also used in the windows in post Sept. 11 cockpit doors being installed on airplanes and Apache helicopter windshields panels; it is today available for Rudy Project Technically Cool Eyewear under a unique and unparalleled lens program: ImpactX™. Read the ImpactX™ Press Release.