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 & light debris. Non-restrictive mobility allows for ample air circulation to prevent fogging. Safety Headgear Accessory Type: Face Shield; for Use With: Fibre-Metal ® F4179 Face Shield Windows; Fibre-Metal ® F4199 Face Shield Windows; Material(s): Noryl ®; Color(s): Gray.