Sontaran space armour

Sontaran space armour, identified by Jingo Linx, was the distinctive battle armour which was worn by the Sontarans. Linx's armour resembled a thick and bulky grey space suit. Their helmets were dome-shaped and almost featureless except for two eye holes and a small, flat crest running from the forehead to the back of the neck. They generally carried around their rod-like weapon and a translating device. (TV: The Time Warrior)

During a period in the early 17th and early 21st century Sontarans had blue, less flexible, armour in a similar design (TV: The Sontaran Stratagem/The Poison Sky, GAME: The Gunpowder Plot) although those Sontarans may have been solely ship crews, since crew armour was blue. Sontarans of the medical and environmental divisions wore green armour, (PROSE: Lords of the Storm) though in 4037, the nurse Strax wore an outfit similar to that of the blue 17th/21st century armour. (TV: A Good Man Goes to War)