Sapphire Defense is a new proprietary, patent-pending composite polymer glass similar to the properties of PMMA, often used as a shatter-resistant alternative to glass. InvisibleSHIELD wanted to make the most protective material possible. The best composition we found is not 100% glass, nor is it 100% film, but a hybrid of the two. An advantage of this hybrid approach is that Sapphire Defense has the feel of glass and the protective nature of a PMMA.