Large L polycarbonate glasses for high impact resistance according to EN166:B. The exhalation valve is particularly durable and easy to clean. The masks are available in three sizes and all feature the 3M bayonet click system for connecting many lightweight double filters for individual protection against gases, vapors, and particles. Four-point attachment for quick and easy on and off. Full masks from the 6000 series can also be combined with 3M compressed air systems for added comfort and flexibility.