Mark 7 Postidion Life Preserver
From Tardis Wiki, the free Doctor Who reference
The Mark 7 Postidion Life Preserver was a form of body armour utilised by Sabalom Glitz. True to its name, the accessory would ultimately save Glitz's life when he was struck in the chest by a harpoon whilst inside the Matrix, with the armour cushioning the harpoon's blow to the point where it had no effect. (TV: The Ultimate Foe)