Imperator-class star destroyers are plated with Dura-Armor, which is a substance composed primarily of synthetic neutronium alloyed with lommite and zesium. Synthetic neutronium possesses most of the properties of neutron star matter, such as incredible hardness and high damage resistance, but in lesser magnitudes and without the negative side effects of natural neutronium (which makes it impractical for widespread commercial use). Zesium is incorporated into the mixture as an ablation agent; its energy absorbing properties have seen widespread use in many military applications, from ground vehicle armor to body armor (zesium particles in the body glove worn by storm troopers help absorb and disperse the energy delivered by blaster bolts). Lommite's precise role in Dura-Armor is unknown, however it is likely that given its commercial application in transparisteel, lommite is used to help reduce the enormous weight of the armor while retaining its other properties (in fact, armored transparisteel may in fact be little more than Dura-Armor with a vastly increased lommite content). In all, Dura-armor is relatively lightweight, possesses phenomenal resistance to damage by either mechanical deformation or radiation/thermal effects, and is a self-contained ablation/dissipation agent for energy effects that manage to overcome its basic resistances. This makes it ideal for application on combat starships.