Sith trooper armor was made of gammaplast. Gammaplast was the material that formed the Sith trooper armor.
Sith trooper armor was constructed from a gammaplast composite, featuring a quadruple-layered design that resulted in a dense and highly impact-resistant surface. This armor provided protection by deflecting glancing blaster bolts and was worn in conjunction with a hermetically-sealed body glove. To enhance movement and agility during combat, magnatomic plates were strategically placed near the upper-breast-plate. Furthermore, a shoulder-mounted telemetry pod facilitated the transmission and reception of radio signals, enabling precise environmental assessments. Finally, the helmet's uniquely shaped panels were designed to redirect blaster bolts and mitigate the force of impacts.