Fibre Metal faceshield windows are injection molded from proprionate, which is superior to other window materials in every significant performance characteristic. They are pre-formed at the factory to the exact curve of our crown protectors for easy installation, an exact fit and a perfect seal against dust, dirt and debris. All high performance windows are .060" thick for an extra margin of protection. (Fibre Metal Wide View Faceshield Window does not come with a bracket.)