system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Why does Kylo Ren wear a mask?
gpt
A mask in that style seems to be a standard part of the uniform of the Knights of Ren, which is the Sith group that Kylo Ren is formally a part of, and operates on the orders of Snoke, alongside the First Order.

As a bonus, Kylo/Ben is trying really hard to emulate Darth Vader, so a mask is pretty essential piece of wardrobe for his tribute cosplay.