Iago's armour differs greatly from other WoIs' armour in several ways:
1. It covers a lot of him, but due to the bone-like nature of the armour, there is less of it and it is very light. This means that he will not be tired out as quickly.
2. The joints in the 'bone' move. This gives him greater mobility.
3. The armour is not very shiny. This makes him virtually undetectable if he does not want to be seen.
4. His helmet has plates of an unbreakable clear orange material over the eyes. This protects his eyes, but if the plates are obscured by dirt (or blood) he will be blinded, so it is also a problem.