The robot's standard resistance against the four damage types (seismic, kinetic, thermal & chemical). The unit of this resistance works as a reference. The higher this number is, the stiffer the robot's resistance is to the specific damage type.
The only gains that matter are percentage of the resistance. % of resistance is mapped to a curve from 0 to 1000 points non-linearly, as in, you gain a lot more from first few point than you do from ones that follow.
Main article: Armor#Armor hardeners
Basic resistances of a robot can be enhanced with the use of active and passive modules.They are added to the resistance score of the robot depending on their state.