Phase II clone trooper armor/Legends

Phase II clone trooper armor was an enhanced version of the Phase I clone trooper armor.

Characteristics
Phase II incorporated all of its predecessor's systems in addition to polarized lenses, padding, and stronger, lighter armor plates. It could also  support more modular attachments, making it superior to its predecessor. It was far more comfortable for Humans to wear than its predecessor, since the Kaminoans had become more familiar with Human anatomy. Unlike early iterations of the Phase I armor, color was used to denote unit affiliation, not rank.

Phase II armor was introduced around 21 BBY, and slowly replaced Phase I armor in the months following. Phase II armor was the basis of the stormtrooper armor later worn by the soldiers of Emperor Palpatine's Empire. Another variant of the Phase II armor was the Katarn armor. ARC trooper armor was also modified to be Phase II.

The new armor incorporated a more advanced air filtration and oxygen supply system, polarized lenses, and an annunciator to make speech more comprehensible. In addition, the boots were magnetized and incorporated a grav-field alternator to ensure stability. Another useful feature was that the armor and the bodysuit could be pressurized, allowing the clones to fight longer in a vacuum environment than its predecessor.(though medical recovery was still needed for longer exposures).

Variations
The Phase II armor, unlike the Phase I armor in many ways, had many different variations. Some armor, was modified to suit the individual clone, while some armor, like the previous Phase I, was specialized to suit a certain 'breed' of troopers (such as clone paratroopers). It is known that some clones, like Faie and CC-1004, had more than one set of armor. Many Clone Commanders and ARC troopers had special attachments on their armor, and allowed some lower ranked officers to wear special attachments as well. Some special attachments included kamas and pauldrons, they could also attach electrobinoculars and sun visors to their helmets. Clone captains would occasionally have a pair of DC-17 hand blasters attached to each side of their kama. Camouflaged armor was mainly used by ARC and ARF troopers, but occasionally camouflaged armor was issued.

Behind the scenes
The Phase II clone trooper pilots' helmets were meant to be a fusion between the Rebel pilots' helmets and the TIE pilots' helmets, both seen in A New Hope. . The helmet of the main Phase II Clone Trooper is a fusion of the Stormtrooper helmet and Phase I clone trooper armor helmet.

Non-canon appearances

 * LEGO Star Wars: The Video Game
 * LEGO Star Wars: The Complete Saga
 * LEGO Star Wars: The Padawan Menace