The 3M™ Speedglas™ G5-01 1000 APF Kit with Neck Shroud and Head Cover is an optional kit that's optimized for ultimate protection. When properly installed on a 3M™ Speedglas™ G5-01 Heavy-Duty Welding Helmet, this kit has an assigned protection factor of 1,000 — compared to the standard APF of 25. Help weld safely with the 3M™ Speedglas™ G5-01 1000 APF Kit with Neck Shroud and Head Cover.Welding spark, spatter, and radiation on the ears and neck are all dangerous hazards that welders can be exposed to on the job. By adding the 3M Speedglas G5-01 1000 APF Kit with Neck Shroud and Head Cover to your 3M Speedglas G5-01 Heavy-Duty Welding Helmet Assembly, you gain an added layer of protection against these threats. When you need your equipment to be uncompromising, don't compromise equip the 3M Speedglas G5-01 1000 APF Kit with Neck Shroud and Head Cover.