With it s clear polycarbonate visor and modular design, this polycarbonate visor kit is designed t o easily assemble with a range of STIHL hearing protectors. The kit gives users of clearing saws, trimmers and brush cutters the slim, lightweight construction and comfortable build they want with a clear shield design to provide them with the high visibility they need to help work safely and efficiently. Note: Goggles or protective glasses meeting ANSI Standard Z87.1 must be worn under face screen and shield for primary eye protection.