Designed to withstand the most challenging working conditions, High Performance series face shields are constructed from tough, heat-resistant Noryl® plastic. Unique Channel Grip System locks windows firmly in place, maximizing protection against airborne dust, dirt and light debris. Non-restrictive mobility allows for ample air circulation to prevent fogging. 3" Crown Ratchet. Safety Headgear Accessory Type: Face Shield; For Use With: Fibre-Metal® F4118 Face Shield Windows; Material(s): Noryl®; Color(s): Gray.