Star Wars Knights of the Old Republic II: The Sith Lords/Upgrade items, armor

All overlays and underlays can be created using a workbench with sufficient skill rank and components.

Overlays
Alloy overlays can enhance armor performance. The modifications require a workbench with adequate tools and armor of high quality marked as upgradeable.

Heat Shielding
Special: Upgrade Item, Armor

Armorply Plating
Special: Upgrade Item, Armor

Sound Dampening Overlay
Special: Upgrade Item, Armor

Energy Shielding
Special: Upgrade Item, Armor

Ballistic Shielding
Special: Upgrade Item, Armor

Ablative Plating
Special: Upgrade Item, Medium or Heavy Armor

Bonded Plates
Special: Upgrade Item, Medium or Heavy Armor

Heavy Bonded Plates
Special: Upgrade Item, Heavy Armor

Underlays
Underlay can have a variety of effects on the armor to which it is applied. The modifications require a workbench with adequate tools and armor of high quality marked as upgradeable.

Environment Underlay
Special: Upgrade Item, Armor and ../Robes/

Biorestorative Underlay
Special: Upgrade Item, Armor and ../Robes/

Armorweave Underlay
Special: Upgrade Item, Armor

Strengthening Underlay
Special: Upgrade Item, Armor

Durasteel Underlay
Special: Upgrade Item, Armor

Flexible Underlay
Special: Upgrade Item, Heavy Armor