From System Shock 2 Wiki
Light Armour
The Dartech class 1 armor requires a strength of 2 in order to equip. The armor is a complex mesh of Kevlar and substrate steel mesh that provides lightweight, marginally effective firepower stoppage. The armor is not only designed to resist penetration, but also to disperse the kinetic energy of the impact throughout its frame. Dartech is the arm of TriOps military branch that generally supplies the poorer belligerents, such as terrorists and local militias. While it's better than nothing, more than one wearer has met an unpleasant end while wearing the Dartech class 1.
Standard Armour
The SenniTech class 3 armor requires a strength of 4 to equip. It is composed of a triple-layered composite of self-stiffening resins and long-chain replicating polymers. Heavier than the Dartech class 1, the class 3 also provides substantially more protection from hostile firepower. The SenniTech subdivision of the TriOptimum military provides the armor for many light infantry platoons of both the UNN and corporate military forces.
Heavy Armour
The UltraTech class 5 combat armor requires a strength of 6 to equip, and is close to the best you can get without continuous power. A weave of titanium/kevlar shielding panels overlays a regenerative polymer gel, and provides serious protection from both physical and energy attacks.
Powered Armour
The UltraTech class 7 combat armor requires power to run the repulsion fields and support the shielding panels, and requires a strength of 3 to equip. It burns 1% of its charge every five seconds. The class 7 armor is the TriOptimum military division's top model. From the solid titanium/polymer shielding panels to the 1-inch repulsion field around the wearer, the class 7 is the premier in protection. While supposedly available for UNN military, most class 7 models seem to be available principally for TriOptimum security forces.
Hazard Suit
The TriOptimum Zero-Phase Hazard Armor uses a combination of triple-layer rubberized mesh, reflective shielding, and low-intensity force field path warps, in order to protect its wearer from not only vacuum but other environmental hazards such as radiation and chemical spills. Competitors such as the HaziShield Group and Wykodyne have claimed that keeping force field generators so close to the skin for long periods of time can be carcinogenic, but most wearers are more concerned about short-term hazards and prefer the added protection.
WormSkin Armour
This armor provides both combat and environmental protection, as well as increases the wearers PSI stat by 2. However, it slowly drains the users psi points.
