3M Clear Adjustable Face Shield, Replaceable Polycarbonate Window. Engineered to be comfortable, convenient, and functional to help keep professionals and DIYers safe. Designed to help protect the eyes and face against certain impact and chemical hazards. Polycarbonate window maximizes strength and durability. Pinlock system allows for easy adjustments and provides a secure, custom fit. Crown protector is made of high-strength thermoplastic material. Proprietary window attachment system is easy to replace. Designed to provide comprehensive eye and face protection in even the most demanding work environments. 3M highly recommends wearing eye protection when wearing headgear and face shields. Meets the requirements of ANSI Z87.1-2003.