Armor of Altaïr

After becoming Master of the Order, Altaïr used the knowledge from within The Apple to construct an unbreakable and light Set of Armor.

History
Unlike the robe Altaïr wore during the events of Assassin's Creed, this armor provides more protection against attacks and is dyed black/red. Due to its advanced design, it is more similar to the armor Giovanni and Ezio wear than Altaïr's original armor. The armor is seen in Assassin's Creed II.

Assassin's Creed II
Years later, Altaïr's Armor was stored inside a vault below the Auditore Villa, locked behind bars which only open when all six seals from hidden Assassins' tombs are collected and placed on their respective statues. As each seal is placed, a bar (to which the placed seal corresponds) retracts into the wall. When all six seals are placed, the bars that block access to the Altaïr's armor retracts into the floor, granting access to the armor. Altaïr's armor is the most powerful armor in Assassin's Creed II. Since it cannot break, it doesn't need to be repaired, which saves the user a great deal of florins. Unfortunately, the outside of the armor cannot be dyed visibly when worn; only the inside of the hood is affected by dyeing Ezio's clothes with the aid of a Tailor. In Altaïr's codex pages, he claims to have created a new metal which is incredibly strong whilst being light as a feather. In a contrast to other assassin's robes, Altaïr's Armor is black, while Ezio and Altaïr originally wore white. The black color scheme can be attributed to the rank of Grandmaster of the Syrian Assassin's Sect, which Altaïr obtained after defeating Al Mualim. Once you've obtained it, it can be taken on and off in the Villa in the armor room.

Trivia

 * According to a concept art, it seems that the armor was intended to be an invention by Leonardo da Vinci before being a creation of Altaïr.
 * Also, while wearing the armor, the burn mark Ezio obtained during Memory Sequence Eleven does not appear at all. This may be a Creator's mistake, or a side effect. Also the hood is never down, although in a cut-scenes with the hood - it's usually down.
 * In Assassins Creed II Black Edition, the collectible Ezio figurine does not wear the same Altaïr's armor as opposed to the game.