It is a USA-made, high-tech polycarbonate film that is applied to your existing glass, which armors it from breach by impact by either hurricane-force winds or human intrusion. Flying glass injuries thousands every year, and it also kills. We sell it because the same film was chosen for installation on all federal buildings in DC, etc. after 9/11 (for explosion protection). Window breaks lead to roof uplift as the winds enter and look for a way out. That leads to structural failure in storms, and burglar break-ins. Armor Glass upgrades a material – glass – that has not evolved in 5,000 years, until now. More details in the Free EBook “Houses of Straw.