Light Armor

Initially used on worlds where traditional armor plating was in short supply, fiber armor is specially designed to channel energy-weapon attacks away from the body. The various metal fibers woven into the exterior of this armor cause it to absorb and harmlessly disperse energy damage. However, fiber armor is far from perfect, and lucky shots manage to hit. Once per encounter, a character fighting defensively while wearing fiber armor can gain DR 10 against a single ranged attack as a reaction.

Source: Knights of the Old Republic Campaign Guide, p. 72.