Although Kylo Ren emulated Grandpa Darth Vader by spending the majority of Star Wars: The Force Awakens wearing his mask, that piece of creepy head gear didn’t get much screen time, as he destroyed it in a fit of rage after a meeting with Snoke went poorly.
However, rather than toss the pieces into the nearest trash compactor, Kylo decided to keep them around and put the mask back together, as shown in the teaser trailer for Star Wars: The Rise of Skywalker.