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|Atmospheric density jacket|
An atmospheric density jacket, or ADJ, was a garment which resembled an Earth anorak, worn to protect the wearer against thin atmospheres. It had been invented by the First Doctor in case an accident on board the TARDIS accidentally deprived him of sufficient air. (PROSE: The Lost Ones)
A key feature of an ADJ was the resipiratory compensator affixed to its breast. Ian likened the compensator to an "advanced oxygen mask". (TV: "The Web Planet") The effective life of an ADJ was only about an hour, after which it had to be recharged. (TV: "The Zarbi")
The Doctor wore an ADJ on his first three visits to Vortis, but not on any subsequent ones. (PROSE: The Lost Ones, PROSE: The Lair of Zarbi Supremo, TV: The Web Planet) On the third visit, during which Ian also wore an ADJ, the garments ran out of power and were discarded. (TV: The Web Planet)