In The Lost Frontier, Jak can collect armor from blue treasure chests at certain points in the game. Each set of armor adds additional hit points to Jak's health meter, each increasing in amount with subsequent sets acquired. The hit points do not stack, however, as when one set of armor is traded out for another, the hit points are replaced accordingly (in other words, when you pick up a new armor set, you will only see one hit point added to the meter, except for the last set with which you will gain two points).
Each armor set is trimmed with glowing lights. The color of this trim changes according to which category of eco skill you have spent the most dark eco on. For example, if you have spent more dark eco on red eco skills than any other color, your armor will glow red. Once your eco skills are maxed out, your armor will glow white.