The fighter's skin is covered by a fiber-optic material that can change colors to match the general environment.
Skin Color
Color change takes 15 to 60 seconds, in which the armor becomes the exact same color as the predominant one in the area. In the woods or in broken terrain, the fighter will also create stripes and blotches of lighter and darker color like a camouflage pattern. In all cases, the fighter is difficult to spot: -20% for others to detect ambush and detect concealment, +5% to the wearers prowl skill, and even characters without prowl have a 40% chance of not being seen if they stay under cover and don't move.
Thermal Countermeasures
The system also masks infrared and thermal emissions, making the fighter's heat invisible to infrared and thermal optics. There is only a 21% chance of the fighter showing up on thermal systems and even then the reading/image will seem unusual.