Currently all infantry units are unarmored. There aren't any mechs or weapon systems with this armor class. Unarmored Units can be easily damaged by light weapons like handguns, rifles, SMGs, shotguns or heavy machine guns. Furthermore explosives like hand grenades do a lot of damage against this armor class.
This is the armor class for small and fast mechs like the PZM-9 "Straznik" or the PZM-7 "Smialy", as well as for exosuits. Like unarmored units, Light armor can be damaged by light weapons, even if it takes clearly longer to do to serious damage. Light armor is very vulnerable to field cannons, gunners and mechs with anti-mech weapons.
This armor class relates to the heaviest mechs in the game. The PZM-16 "Zółw" is an example for a mech that is equiped with heavy armor. Heavy armor is very well armored against light weapons. Only field cannons and mechs with anti-mech weapons can inflict meaningful damage.
Structures have this armor class.
A lot of mechs in the game have weak points (often at their back), which allow to inflict higher damage (the damage is doubled), when hitting these weak points.
Fog of War