The Scale Armor is part of the Hexxit Gear mod. It is one of three sets of Hexxit Gear Armor. When fully equipped, the player gets infinite Strength, Resistance and Fire Resistance II potion effects, as well as the maximum 20 Armor Points, the equivalent to wearing full Diamond armor; it is also the most defensive armor, even from Rapiers.
This armor set gives Fire Resistance II, which have no difference from Fire Resistance I; it is unknown why the creator of this armor used Fire Resistance II instead of I.
Oddly enough, this armor set does not give any more protection than others. But it would seem like it would be VERY protective; considering its made out of obsidian and gold. While others are made out of leather, bone, and wool.
The full set of armor is dubbed the best for meele battles, due to the strength and Fire resistance buffs.