
They reduced the perception of the wearer, especially peripheral vision, making them vulnerable to threats such as snipers. But they weren't invulnerable if hit at certain angles, a shot from a Longshot Sniper Rifle could pierce the helmet and kill the wearer. The helmet was protective, proven by Clayton Carmine's life being saved after a bullet from a Stranded's sniper rifle hit the side of Clay's helmet and was deflected. In these situations, some variants of the helmets, such as Clayton Carmine's unique variant, had external ports on the sides of the helmet which would allow the wearer to attach an additional external filter to help compensate for the large amount of pollutants so as to not overtax the regular filters. They could be overtaxed, as shown when helmet filters had to be replaced frequently following the Hammer of Dawn Counterattack, due to the amount of dust and pollutants in the air, or when having to filter large amounts of various poisonous gases, such as Imulsion fumes.

Filtration System Īll COG combat helmets had an internal air filtration system which protected the wearer from dust, ash, and other harmful materials in the air so the wearer wasn't impeded during battle, but these inertial air filtrations systems did have a limit. Clayton with an additional filter attached to his helmet to filter out Imulsion fumes.
