|For the derived statistic, see Radiation Resistance.|
For a cross-game overview of this perk, see Rad Resistance.
With this perk, one's radiation resistance improves by 25%.
The necessity of this perk is questionable, since it is trivially easy to temporarily boost radiation resistance to the maximum with Rad-X and various radiation-resistant armor. Combined with the fact that there are few areas with a high enough radiation level to warrant such resistance, there is no pressing need to take it.